72405265456643 has 48 divisors (see below), whose sum is σ = 85921336869984. Its totient is φ = 60820425469440.

The previous prime is 72405265456639. The next prime is 72405265456649. The reversal of 72405265456643 is 34665456250427.

It is not a de Polignac number, because 72405265456643 - 2² = 72405265456639 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72405265456649) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4577678471 + ... + 4577694287.

It is an arithmetic number, because the mean of its divisors is an integer number (1790027851458).

Almost surely, 2^{72405265456643} is an apocalyptic number.

72405265456643 is a deficient number, since it is larger than the sum of its proper divisors (13516071413341).

72405265456643 is a wasteful number, since it uses less digits than its factorization.

72405265456643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21412 (or 21405 counting only the distinct ones).

The product of its (nonzero) digits is 145152000, while the sum is 59.

The spelling of 72405265456643 in words is "seventy-two trillion, four hundred five billion, two hundred sixty-five million, four hundred fifty-six thousand, six hundred forty-three".