157638327690 has 32 divisors (see below), whose sum is σ = 379678383936. Its totient is φ = 41887287680.

The previous prime is 157638327683. The next prime is 157638327739. The reversal of 157638327690 is 96723836751.

It is a super-2 number, since 2×157638327690² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 157638327690.

It is an unprimeable number.

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, 9341412 + ... + 9358271.

It is an arithmetic number, because the mean of its divisors is an integer number (11864949498).

Almost surely, 2^157638327690 is an apocalyptic number.

157638327690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

157638327690 is an abundant number, since it is smaller than the sum of its proper divisors (222040056246).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

157638327690 is a wasteful number, since it uses less digits than its factorization.

157638327690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18699974.

The product of its (nonzero) digits is 11430720, while the sum is 57.

The spelling of 157638327690 in words is "one hundred fifty-seven billion, six hundred thirty-eight million, three hundred twenty-seven thousand, six hundred ninety".