165656506455321 has 16 divisors (see below), whose sum is σ = 252435243924864. Its totient is φ = 94658505191424.

The previous prime is 165656506455263. The next prime is 165656506455367. The reversal of 165656506455321 is 123554605656561.

165656506455321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 165656506455321 - 2¹³ = 165656506447129 is a prime.

It is not an unprimeable number, because it can be changed into a prime (165656506455371) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 97287526 + ... + 98975631.

It is an arithmetic number, because the mean of its divisors is an integer number (15777202745304).

Almost surely, 2^{165656506455321} is an apocalyptic number.

It is an amenable number.

165656506455321 is a deficient number, since it is larger than the sum of its proper divisors (86778737469543).

165656506455321 is a wasteful number, since it uses less digits than its factorization.

165656506455321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196303360.

The product of its (nonzero) digits is 97200000, while the sum is 60.

The spelling of 165656506455321 in words is "one hundred sixty-five trillion, six hundred fifty-six billion, five hundred six million, four hundred fifty-five thousand, three hundred twenty-one".