660155202161771 has 4 divisors (see below), whose sum is σ = 660162926161200. Its totient is φ = 660147478162344.

The previous prime is 660155202161723. The next prime is 660155202161797. The reversal of 660155202161771 is 177161202551066.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-660155202161771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (660155202160771) 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, 3861871511 + ... + 3862042448.

It is an arithmetic number, because the mean of its divisors is an integer number (165040731540300).

Almost surely, 2^{660155202161771} is an apocalyptic number.

660155202161771 is a deficient number, since it is larger than the sum of its proper divisors (7723999429).

660155202161771 is an equidigital number, since it uses as much as digits as its factorization.

660155202161771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7723999428.

The product of its (nonzero) digits is 1058400, while the sum is 50.

The spelling of 660155202161771 in words is "six hundred sixty trillion, one hundred fifty-five billion, two hundred two million, one hundred sixty-one thousand, seven hundred seventy-one".