165656516420503 has 8 divisors (see below), whose sum is σ = 168242067747072. Its totient is φ = 163074290564856.

The previous prime is 165656516420383. The next prime is 165656516420531. The reversal of 165656516420503 is 305024615656561.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165656516420503 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165656516420803) 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, 831267325 + ... + 831466582.

It is an arithmetic number, because the mean of its divisors is an integer number (21030258468384).

Almost surely, 2^{165656516420503} is an apocalyptic number.

165656516420503 is a deficient number, since it is larger than the sum of its proper divisors (2585551326569).

165656516420503 is a wasteful number, since it uses less digits than its factorization.

165656516420503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1662735461.

The product of its (nonzero) digits is 19440000, while the sum is 55.

The spelling of 165656516420503 in words is "one hundred sixty-five trillion, six hundred fifty-six billion, five hundred sixteen million, four hundred twenty thousand, five hundred three".