163501223121655 has 16 divisors (see below), whose sum is σ = 200904982717824. Its totient is φ = 127669565187360.

The previous prime is 163501223121631. The next prime is 163501223121679. The reversal of 163501223121655 is 556121322105361.

It is an interprime number because it is at equal distance from previous prime (163501223121631) and next prime (163501223121679).

It is not a de Polignac number, because 163501223121655 - 2⁷ = 163501223121527 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 266151081 + ... + 266764690.

It is an arithmetic number, because the mean of its divisors is an integer number (12556561419864).

Almost surely, 2^{163501223121655} is an apocalyptic number.

163501223121655 is a deficient number, since it is larger than the sum of its proper divisors (37403759596169).

163501223121655 is a wasteful number, since it uses less digits than its factorization.

163501223121655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 532917246.

The product of its (nonzero) digits is 324000, while the sum is 43.

The spelling of 163501223121655 in words is "one hundred sixty-three trillion, five hundred one billion, two hundred twenty-three million, one hundred twenty-one thousand, six hundred fifty-five".