255658939961 has 2 divisors, whose sum is σ = 255658939962. Its totient is φ = 255658939960.

The previous prime is 255658939903. The next prime is 255658939967. The reversal of 255658939961 is 169939856552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 235085340736 + 20573599225 = 484856^2 + 143435^2 .

It is a cyclic number.

It is not a de Polignac number, because 255658939961 - 2³⁰ = 254585198137 is a prime.

It is a super-2 number, since 2×255658939961² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 255658939891 and 255658939900.

It is not a weakly prime, because it can be changed into another prime (255658939967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127829469980 + 127829469981.

It is an arithmetic number, because the mean of its divisors is an integer number (127829469981).

Almost surely, 2^255658939961 is an apocalyptic number.

It is an amenable number.

255658939961 is a deficient number, since it is larger than the sum of its proper divisors (1).

255658939961 is an equidigital number, since it uses as much as digits as its factorization.

255658939961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 157464000, while the sum is 68.

The spelling of 255658939961 in words is "two hundred fifty-five billion, six hundred fifty-eight million, nine hundred thirty-nine thousand, nine hundred sixty-one".