123551099957 has 2 divisors, whose sum is σ = 123551099958. Its totient is φ = 123551099956.

The previous prime is 123551099909. The next prime is 123551099963. The reversal of 123551099957 is 759990155321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65068867396 + 58482232561 = 255086^2 + 241831^2 .

It is a cyclic number.

It is not a de Polignac number, because 123551099957 - 2²⁰ = 123550051381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123551099657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61775549978 + 61775549979.

It is an arithmetic number, because the mean of its divisors is an integer number (61775549979).

Almost surely, 2^123551099957 is an apocalyptic number.

It is an amenable number.

123551099957 is a deficient number, since it is larger than the sum of its proper divisors (1).

123551099957 is an equidigital number, since it uses as much as digits as its factorization.

123551099957 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3827250, while the sum is 56.

The spelling of 123551099957 in words is "one hundred twenty-three billion, five hundred fifty-one million, ninety-nine thousand, nine hundred fifty-seven".