400123746557 has 2 divisors, whose sum is σ = 400123746558. Its totient is φ = 400123746556.

The previous prime is 400123746527. The next prime is 400123746563. The reversal of 400123746557 is 755647321004.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 384175592761 + 15948153796 = 619819^2 + 126286^2 .

It is a cyclic number.

It is not a de Polignac number, because 400123746557 - 2²² = 400119552253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400123746527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200061873278 + 200061873279.

It is an arithmetic number, because the mean of its divisors is an integer number (200061873279).

Almost surely, 2^400123746557 is an apocalyptic number.

It is an amenable number.

400123746557 is a deficient number, since it is larger than the sum of its proper divisors (1).

400123746557 is an equidigital number, since it uses as much as digits as its factorization.

400123746557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 705600, while the sum is 44.

The spelling of 400123746557 in words is "four hundred billion, one hundred twenty-three million, seven hundred forty-six thousand, five hundred fifty-seven".