122557540661 has 2 divisors, whose sum is σ = 122557540662. Its totient is φ = 122557540660.

The previous prime is 122557540657. The next prime is 122557540667. The reversal of 122557540661 is 166045755221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 103165585636 + 19391955025 = 321194^2 + 139255^2 .

It is a cyclic number.

It is not a de Polignac number, because 122557540661 - 2² = 122557540657 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (122557540667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61278770330 + 61278770331.

It is an arithmetic number, because the mean of its divisors is an integer number (61278770331).

Almost surely, 2^122557540661 is an apocalyptic number.

It is an amenable number.

122557540661 is a deficient number, since it is larger than the sum of its proper divisors (1).

122557540661 is an equidigital number, since it uses as much as digits as its factorization.

122557540661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 504000, while the sum is 44.

The spelling of 122557540661 in words is "one hundred twenty-two billion, five hundred fifty-seven million, five hundred forty thousand, six hundred sixty-one".