122656215561 has 16 divisors (see below), whose sum is σ = 183230908608. Its totient is φ = 72327988800.

The previous prime is 122656215467. The next prime is 122656215587. The reversal of 122656215561 is 165512656221.

It is not a de Polignac number, because 122656215561 - 2⁹ = 122656215049 is a prime.

It is not an unprimeable number, because it can be changed into a prime (122656215061) 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, 50226550 + ... + 50228991.

It is an arithmetic number, because the mean of its divisors is an integer number (11451931788).

Almost surely, 2^122656215561 is an apocalyptic number.

122656215561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

122656215561 is a deficient number, since it is larger than the sum of its proper divisors (60574693047).

122656215561 is a wasteful number, since it uses less digits than its factorization.

122656215561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100455592.

The product of its digits is 216000, while the sum is 42.

The spelling of 122656215561 in words is "one hundred twenty-two billion, six hundred fifty-six million, two hundred fifteen thousand, five hundred sixty-one".