172157261390 has 16 divisors (see below), whose sum is σ = 311614264080. Its totient is φ = 68478194880.

The previous prime is 172157261369. The next prime is 172157261401. The reversal of 172157261390 is 93162751271.

172157261390 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48086831 + ... + 48090410.

It is an arithmetic number, because the mean of its divisors is an integer number (19475891505).

Almost surely, 2^172157261390 is an apocalyptic number.

172157261390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

172157261390 is a deficient number, since it is larger than the sum of its proper divisors (139457002690).

172157261390 is a wasteful number, since it uses less digits than its factorization.

172157261390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96177427.

The product of its (nonzero) digits is 158760, while the sum is 44.

The spelling of 172157261390 in words is "one hundred seventy-two billion, one hundred fifty-seven million, two hundred sixty-one thousand, three hundred ninety".