72155505706499 has 32 divisors (see below), whose sum is σ = 79185632011200. Its totient is φ = 65443897774080.

The previous prime is 72155505706451. The next prime is 72155505706517. The reversal of 72155505706499 is 99460750555127.

It is a cyclic number.

It is not a de Polignac number, because 72155505706499 - 2⁸ = 72155505706243 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72155505706409) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2132931317 + ... + 2132965145.

It is an arithmetic number, because the mean of its divisors is an integer number (2474551000350).

Almost surely, 2^{72155505706499} is an apocalyptic number.

72155505706499 is a deficient number, since it is larger than the sum of its proper divisors (7030126304701).

72155505706499 is a wasteful number, since it uses less digits than its factorization.

72155505706499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42023.

The product of its (nonzero) digits is 119070000, while the sum is 65.

The spelling of 72155505706499 in words is "seventy-two trillion, one hundred fifty-five billion, five hundred five million, seven hundred six thousand, four hundred ninety-nine".