72165446451 has 16 divisors (see below), whose sum is σ = 122184883200. Its totient is φ = 41237397864.

The previous prime is 72165446443. The next prime is 72165446497. The reversal of 72165446451 is 15464456127.

72165446451 is a `hidden beast` number, since 7 + 2 + 165 + 446 + 45 + 1 = 666.

It is not a de Polignac number, because 72165446451 - 2³ = 72165446443 is a prime.

It is a super-2 number, since 2×72165446451² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 72165446397 and 72165446406.

It is not an unprimeable number, because it can be changed into a prime (72165406451) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 190913691 + ... + 190914068.

It is an arithmetic number, because the mean of its divisors is an integer number (7636555200).

Almost surely, 2^72165446451 is an apocalyptic number.

72165446451 is a deficient number, since it is larger than the sum of its proper divisors (50019436749).

72165446451 is a wasteful number, since it uses less digits than its factorization.

72165446451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381827775 (or 381827769 counting only the distinct ones).

The product of its digits is 806400, while the sum is 45.

The spelling of 72165446451 in words is "seventy-two billion, one hundred sixty-five million, four hundred forty-six thousand, four hundred fifty-one".