165656477 has 4 divisors (see below), whose sum is σ = 189321696. Its totient is φ = 141991260.

The previous prime is 165656473. The next prime is 165656489. The reversal of 165656477 is 774656561.

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 165656477 - 2² = 165656473 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 (165656471) 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, 11832599 + ... + 11832612.

It is an arithmetic number, because the mean of its divisors is an integer number (47330424).

Almost surely, 2^165656477 is an apocalyptic number.

It is an amenable number.

165656477 is a deficient number, since it is larger than the sum of its proper divisors (23665219).

165656477 is an equidigital number, since it uses as much as digits as its factorization.

165656477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23665218.

The product of its digits is 1058400, while the sum is 47.

The square root of 165656477 is about 12870.7605447386. The cubic root of 165656477 is about 549.2070965844.

The spelling of 165656477 in words is "one hundred sixty-five million, six hundred fifty-six thousand, four hundred seventy-seven".