72120565241557 has 16 divisors (see below), whose sum is σ = 82911230236800. Its totient is φ = 61451929357632.

The previous prime is 72120565241551. The next prime is 72120565241561. The reversal of 72120565241557 is 75514256502127.

It is a cyclic number.

It is not a de Polignac number, because 72120565241557 - 2³¹ = 72118417757909 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72120565241551) 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, 4847758 + ... + 12951520.

It is an arithmetic number, because the mean of its divisors is an integer number (5181951889800).

Almost surely, 2^{72120565241557} is an apocalyptic number.

It is an amenable number.

72120565241557 is a deficient number, since it is larger than the sum of its proper divisors (10790664995243).

72120565241557 is a wasteful number, since it uses less digits than its factorization.

72120565241557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8111292.

The product of its (nonzero) digits is 5880000, while the sum is 52.

The spelling of 72120565241557 in words is "seventy-two trillion, one hundred twenty billion, five hundred sixty-five million, two hundred forty-one thousand, five hundred fifty-seven".