165556533511351 has 4 divisors (see below), whose sum is σ = 165588438803400. Its totient is φ = 165524628219304.

The previous prime is 165556533511337. The next prime is 165556533511357. The reversal of 165556533511351 is 153115335655561.

165556533511351 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 165556533511351 - 2¹⁹ = 165556532987063 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 165556533511292 and 165556533511301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165556533511357) 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, 15952638241 + ... + 15952648618.

It is an arithmetic number, because the mean of its divisors is an integer number (41397109700850).

Almost surely, 2^{165556533511351} is an apocalyptic number.

165556533511351 is a deficient number, since it is larger than the sum of its proper divisors (31905292049).

165556533511351 is an equidigital number, since it uses as much as digits as its factorization.

165556533511351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31905292048.

The product of its digits is 15187500, while the sum is 55.

The spelling of 165556533511351 in words is "one hundred sixty-five trillion, five hundred fifty-six billion, five hundred thirty-three million, five hundred eleven thousand, three hundred fifty-one".