172421551757 has 16 divisors (see below), whose sum is σ = 224694150912. Its totient is φ = 128396655360.

The previous prime is 172421551727. The next prime is 172421551759. The reversal of 172421551757 is 757155124271.

It is a cyclic number.

It is not a de Polignac number, because 172421551757 - 2¹⁶ = 172421486221 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172421551759) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55726169 + ... + 55729262.

It is an arithmetic number, because the mean of its divisors is an integer number (14043384432).

Almost surely, 2^172421551757 is an apocalyptic number.

172421551757 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

172421551757 is a deficient number, since it is larger than the sum of its proper divisors (52272599155).

172421551757 is a wasteful number, since it uses less digits than its factorization.

172421551757 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111455468.

The product of its digits is 686000, while the sum is 47.

The spelling of 172421551757 in words is "one hundred seventy-two billion, four hundred twenty-one million, five hundred fifty-one thousand, seven hundred fifty-seven".