675619885521 has 63 divisors (see below), whose sum is σ = 1178619725451. Its totient is φ = 385979734224.

The previous prime is 675619885487. The next prime is 675619885529. The reversal of 675619885521 is 125588916576.

The square root of 675619885521 is 821961.

It is a perfect power (a square), and thus also a powerful number.

675619885521 is a `hidden beast` number, since 6 + 7 + 5 + 619 + 8 + 8 + 5 + 5 + 2 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 15138595521 + 660481290000 = 123039^2 + 812700^2 .

It is a tau number, because it is divible by the number of its divisors (63).

It is not a de Polignac number, because 675619885521 - 2⁷ = 675619885393 is a prime.

It is a super-2 number, since 2×675619885521² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (675619885529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 62 ways as a sum of consecutive naturals, for example, 155348455 + ... + 155352803.

Almost surely, 2^675619885521 is an apocalyptic number.

675619885521 is the 821961-st square number.

675619885521 is the 410981-st centered octagonal number.

It is an amenable number.

675619885521 is a deficient number, since it is larger than the sum of its proper divisors (502999839930).

675619885521 is an frugal number, since it uses more digits than its factorization.

675619885521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8730 (or 4359 counting only the distinct ones).

The product of its digits is 36288000, while the sum is 63.

The spelling of 675619885521 in words is "six hundred seventy-five billion, six hundred nineteen million, eight hundred eighty-five thousand, five hundred twenty-one".