121557713663 has 2 divisors, whose sum is σ = 121557713664. Its totient is φ = 121557713662.

The previous prime is 121557713579. The next prime is 121557713689. The reversal of 121557713663 is 366317755121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121557713663 - 2¹⁶ = 121557648127 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121557715663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60778856831 + 60778856832.

It is an arithmetic number, because the mean of its divisors is an integer number (60778856832).

Almost surely, 2^121557713663 is an apocalyptic number.

121557713663 is a deficient number, since it is larger than the sum of its proper divisors (1).

121557713663 is an equidigital number, since it uses as much as digits as its factorization.

121557713663 is an evil number, because the sum of its binary digits is even.

The product of its digits is 793800, while the sum is 47.

The spelling of 121557713663 in words is "one hundred twenty-one billion, five hundred fifty-seven million, seven hundred thirteen thousand, six hundred sixty-three".