75242608821 has 24 divisors (see below), whose sum is σ = 117883695384. Its totient is φ = 46059555840.

The previous prime is 75242608781. The next prime is 75242608823. The reversal of 75242608821 is 12880624257.

75242608821 is a `hidden beast` number, since 7 + 524 + 26 + 0 + 88 + 21 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 106316721 + 75136292100 = 10311^2 + 274110^2 .

It is not a de Polignac number, because 75242608821 - 2²¹ = 75240511669 is a prime.

It is a super-2 number, since 2×75242608821² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75242608823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5991066 + ... + 6003611.

It is an arithmetic number, because the mean of its divisors is an integer number (4911820641).

Almost surely, 2^75242608821 is an apocalyptic number.

It is an amenable number.

75242608821 is a deficient number, since it is larger than the sum of its proper divisors (42641086563).

75242608821 is a wasteful number, since it uses less digits than its factorization.

75242608821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11994741 (or 11994738 counting only the distinct ones).

The product of its (nonzero) digits is 430080, while the sum is 45.

The spelling of 75242608821 in words is "seventy-five billion, two hundred forty-two million, six hundred eight thousand, eight hundred twenty-one".