165556463253501 has 4 divisors (see below), whose sum is σ = 220741951004672. Its totient is φ = 110370975502332.

The previous prime is 165556463253397. The next prime is 165556463253521. The reversal of 165556463253501 is 105352364655561.

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 not a de Polignac number, because 165556463253501 - 2⁹ = 165556463252989 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 (165556463253521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27592743875581 + ... + 27592743875586.

It is an arithmetic number, because the mean of its divisors is an integer number (55185487751168).

Almost surely, 2^{165556463253501} is an apocalyptic number.

It is an amenable number.

165556463253501 is a deficient number, since it is larger than the sum of its proper divisors (55185487751171).

165556463253501 is an equidigital number, since it uses as much as digits as its factorization.

165556463253501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55185487751170.

The product of its (nonzero) digits is 48600000, while the sum is 57.

The spelling of 165556463253501 in words is "one hundred sixty-five trillion, five hundred fifty-six billion, four hundred sixty-three million, two hundred fifty-three thousand, five hundred one".