172157081920777 has 16 divisors (see below), whose sum is σ = 175016829371904. Its totient is φ = 169309552608000.

The previous prime is 172157081920763. The next prime is 172157081920799. The reversal of 172157081920777 is 777029180751271.

It is a cyclic number.

It is not a de Polignac number, because 172157081920777 - 2¹¹ = 172157081918729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172157081920727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 179486173 + ... + 180442789.

It is an arithmetic number, because the mean of its divisors is an integer number (10938551835744).

Almost surely, 2^{172157081920777} is an apocalyptic number.

It is an amenable number.

172157081920777 is a deficient number, since it is larger than the sum of its proper divisors (2859747451127).

172157081920777 is an equidigital number, since it uses as much as digits as its factorization.

172157081920777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 963000.

The product of its (nonzero) digits is 24202080, while the sum is 64.

The spelling of 172157081920777 in words is "one hundred seventy-two trillion, one hundred fifty-seven billion, eighty-one million, nine hundred twenty thousand, seven hundred seventy-seven".