131604353162465 has 4 divisors (see below), whose sum is σ = 157925223794964. Its totient is φ = 105283482529968.

The previous prime is 131604353162461. The next prime is 131604353162467. The reversal of 131604353162465 is 564261353406131.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 95800872235264 + 35803480927201 = 9787792^2 + 5983601^2 .

It is a cyclic number.

It is not a de Polignac number, because 131604353162465 - 2² = 131604353162461 is a prime.

It is a super-2 number, since 2×131604353162465² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131604353162461) 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, 13160435316242 + ... + 13160435316251.

It is an arithmetic number, because the mean of its divisors is an integer number (39481305948741).

Almost surely, 2^{131604353162465} is an apocalyptic number.

It is an amenable number.

131604353162465 is a deficient number, since it is larger than the sum of its proper divisors (26320870632499).

131604353162465 is an equidigital number, since it uses as much as digits as its factorization.

131604353162465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26320870632498.

The product of its (nonzero) digits is 4665600, while the sum is 50.

The spelling of 131604353162465 in words is "one hundred thirty-one trillion, six hundred four billion, three hundred fifty-three million, one hundred sixty-two thousand, four hundred sixty-five".