64157313323261 has 4 divisors (see below), whose sum is σ = 64366294800192. Its totient is φ = 63948331846332.

The previous prime is 64157313323251. The next prime is 64157313323297. The reversal of 64157313323261 is 16232331375146.

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 a cyclic number.

It is not a de Polignac number, because 64157313323261 - 2⁶ = 64157313323197 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 (64157313323251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104490738005 + ... + 104490738618.

It is an arithmetic number, because the mean of its divisors is an integer number (16091573700048).

Almost surely, 2^{64157313323261} is an apocalyptic number.

It is an amenable number.

64157313323261 is a deficient number, since it is larger than the sum of its proper divisors (208981476931).

64157313323261 is a wasteful number, since it uses less digits than its factorization.

64157313323261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208981476930.

The product of its digits is 1632960, while the sum is 47.

The spelling of 64157313323261 in words is "sixty-four trillion, one hundred fifty-seven billion, three hundred thirteen million, three hundred twenty-three thousand, two hundred sixty-one".