65490807554172 has 576 divisors, whose sum is σ = 225572988985344. Its totient is φ = 15470343290880.

The previous prime is 65490807554111. The next prime is 65490807554189. The reversal of 65490807554172 is 27145570809456.

It is a happy number.

65490807554172 is a `hidden beast` number, since 6 + 5 + 4 + 9 + 0 + 8 + 0 + 7 + 554 + 1 + 72 = 666.

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

It is a congruent number.

It is an unprimeable number.

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 191 ways as a sum of consecutive naturals, for example, 779452708 + ... + 779536724.

It is an arithmetic number, because the mean of its divisors is an integer number (391619772544).

Almost surely, 2^{65490807554172} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65490807554172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (112786494492672).

65490807554172 is an abundant number, since it is smaller than the sum of its proper divisors (160082181431172).

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

65490807554172 is a wasteful number, since it uses less digits than its factorization.

65490807554172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84378 (or 84373 counting only the distinct ones).

The product of its (nonzero) digits is 84672000, while the sum is 63.

The spelling of 65490807554172 in words is "sixty-five trillion, four hundred ninety billion, eight hundred seven million, five hundred fifty-four thousand, one hundred seventy-two".