665050125544 has 32 divisors (see below), whose sum is σ = 1425213175680. Its totient is φ = 285000329664.

The previous prime is 665050125541. The next prime is 665050125547. The reversal of 665050125544 is 445521050566.

It is an interprime number because it is at equal distance from previous prime (665050125541) and next prime (665050125547).

It is a super-2 number, since 2×665050125544² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 665050125544.

It is not an unprimeable number, because it can be changed into a prime (665050125541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 332634 + ... + 1200310.

It is an arithmetic number, because the mean of its divisors is an integer number (44537911740).

Almost surely, 2^665050125544 is an apocalyptic number.

It is an amenable number.

665050125544 is an abundant number, since it is smaller than the sum of its proper divisors (760163050136).

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

665050125544 is a wasteful number, since it uses less digits than its factorization.

665050125544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 881377 (or 881373 counting only the distinct ones).

The product of its (nonzero) digits is 720000, while the sum is 43.

The spelling of 665050125544 in words is "six hundred sixty-five billion, fifty million, one hundred twenty-five thousand, five hundred forty-four".