161495987613 has 4 divisors (see below), whose sum is σ = 215327983488. Its totient is φ = 107663991740.

The previous prime is 161495987579. The next prime is 161495987629. The reversal of 161495987613 is 316789594161.

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 161495987613 - 2³⁶ = 92776510877 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161495987683) 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, 26915997933 + ... + 26915997938.

It is an arithmetic number, because the mean of its divisors is an integer number (53831995872).

Almost surely, 2^161495987613 is an apocalyptic number.

It is an amenable number.

161495987613 is a deficient number, since it is larger than the sum of its proper divisors (53831995875).

161495987613 is an equidigital number, since it uses as much as digits as its factorization.

161495987613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53831995874.

The product of its digits is 9797760, while the sum is 60.

The spelling of 161495987613 in words is "one hundred sixty-one billion, four hundred ninety-five million, nine hundred eighty-seven thousand, six hundred thirteen".