665172601248 has 48 divisors (see below), whose sum is σ = 1746361130976. Its totient is φ = 221688257280.

The previous prime is 665172601243. The next prime is 665172601259. The reversal of 665172601248 is 842106271566.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×665172601248² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a junction number, because it is equal to n+sod(n) for n = 665172601197 and 665172601206.

It is not an unprimeable number, because it can be changed into a prime (665172601243) 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 7 ways as a sum of consecutive naturals, for example, 36978 + ... + 1153998.

It is an arithmetic number, because the mean of its divisors is an integer number (36382523562).

Almost surely, 2^665172601248 is an apocalyptic number.

It is an amenable number.

665172601248 is an abundant number, since it is smaller than the sum of its proper divisors (1081188529728).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

665172601248 is a wasteful number, since it uses less digits than its factorization.

665172601248 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1123237 (or 1123229 counting only the distinct ones).

The product of its (nonzero) digits is 967680, while the sum is 48.

The spelling of 665172601248 in words is "six hundred sixty-five billion, one hundred seventy-two million, six hundred one thousand, two hundred forty-eight".