165656516420563 has 8 divisors (see below), whose sum is σ = 189323673942528. Its totient is φ = 141989844121224.

The previous prime is 165656516420539. The next prime is 165656516420579. The reversal of 165656516420563 is 365024615656561.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 165656516420563 - 2⁵ = 165656516420531 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165656516421563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 120573781 + ... + 121939942.

It is an arithmetic number, because the mean of its divisors is an integer number (23665459242816).

Almost surely, 2^{165656516420563} is an apocalyptic number.

165656516420563 is a deficient number, since it is larger than the sum of its proper divisors (23667157521965).

165656516420563 is an equidigital number, since it uses as much as digits as its factorization.

165656516420563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242611313.

The product of its (nonzero) digits is 116640000, while the sum is 61.

The spelling of 165656516420563 in words is "one hundred sixty-five trillion, six hundred fifty-six billion, five hundred sixteen million, four hundred twenty thousand, five hundred sixty-three".