131658320257 has 4 divisors (see below), whose sum is σ = 132936556480. Its totient is φ = 130380084036.

The previous prime is 131658320251. The next prime is 131658320267. The reversal of 131658320257 is 752023856131.

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 131658320257 - 2²⁷ = 131524102529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131658320251) 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, 639117957 + ... + 639118162.

It is an arithmetic number, because the mean of its divisors is an integer number (33234139120).

Almost surely, 2^131658320257 is an apocalyptic number.

It is an amenable number.

131658320257 is a deficient number, since it is larger than the sum of its proper divisors (1278236223).

131658320257 is a wasteful number, since it uses less digits than its factorization.

131658320257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1278236222.

The product of its (nonzero) digits is 302400, while the sum is 43.

The spelling of 131658320257 in words is "one hundred thirty-one billion, six hundred fifty-eight million, three hundred twenty thousand, two hundred fifty-seven".