123945580637 has 2 divisors, whose sum is σ = 123945580638. Its totient is φ = 123945580636.

The previous prime is 123945580607. The next prime is 123945580669. The reversal of 123945580637 is 736085549321.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 98007189721 + 25938390916 = 313061^2 + 161054^2 .

It is a cyclic number.

It is not a de Polignac number, because 123945580637 - 2¹⁰ = 123945579613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123945580607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61972790318 + 61972790319.

It is an arithmetic number, because the mean of its divisors is an integer number (61972790319).

It is a 1-persistent number, because it is pandigital, but 2⋅123945580637 = 247891161274 is not.

Almost surely, 2^123945580637 is an apocalyptic number.

It is an amenable number.

123945580637 is a deficient number, since it is larger than the sum of its proper divisors (1).

123945580637 is an equidigital number, since it uses as much as digits as its factorization.

123945580637 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5443200, while the sum is 53.

The spelling of 123945580637 in words is "one hundred twenty-three billion, nine hundred forty-five million, five hundred eighty thousand, six hundred thirty-seven".