72805861677 has 4 divisors (see below), whose sum is σ = 97074482240. Its totient is φ = 48537241116.

The previous prime is 72805861669. The next prime is 72805861697. The reversal of 72805861677 is 77616850827.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 72805861677 - 2³ = 72805861669 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72805861657) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 12134310277 + ... + 12134310282.

It is an arithmetic number, because the mean of its divisors is an integer number (24268620560).

Almost surely, 2^72805861677 is an apocalyptic number.

It is an amenable number.

72805861677 is a deficient number, since it is larger than the sum of its proper divisors (24268620563).

72805861677 is a wasteful number, since it uses less digits than its factorization.

72805861677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24268620562.

The product of its (nonzero) digits is 7902720, while the sum is 57.

The spelling of 72805861677 in words is "seventy-two billion, eight hundred five million, eight hundred sixty-one thousand, six hundred seventy-seven".