165061666157 has 4 divisors (see below), whose sum is σ = 168900309600. Its totient is φ = 161223022716.

The previous prime is 165061666151. The next prime is 165061666171. The reversal of 165061666157 is 751666160561.

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 165061666157 - 2⁶ = 165061666093 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 (165061666151) 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, 1919321657 + ... + 1919321742.

It is an arithmetic number, because the mean of its divisors is an integer number (42225077400).

Almost surely, 2^165061666157 is an apocalyptic number.

It is an amenable number.

165061666157 is a deficient number, since it is larger than the sum of its proper divisors (3838643443).

165061666157 is an equidigital number, since it uses as much as digits as its factorization.

165061666157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3838643442.

The product of its (nonzero) digits is 1360800, while the sum is 50.

The spelling of 165061666157 in words is "one hundred sixty-five billion, sixty-one million, six hundred sixty-six thousand, one hundred fifty-seven".