265077400661 has 2 divisors, whose sum is σ = 265077400662. Its totient is φ = 265077400660.

The previous prime is 265077400639. The next prime is 265077400681. The reversal of 265077400661 is 166004770562.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 143882903761 + 121194496900 = 379319^2 + 348130^2 .

It is a cyclic number.

It is not a de Polignac number, because 265077400661 - 2⁶ = 265077400597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (265077400681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132538700330 + 132538700331.

It is an arithmetic number, because the mean of its divisors is an integer number (132538700331).

Almost surely, 2^265077400661 is an apocalyptic number.

It is an amenable number.

265077400661 is a deficient number, since it is larger than the sum of its proper divisors (1).

265077400661 is an equidigital number, since it uses as much as digits as its factorization.

265077400661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 423360, while the sum is 44.

The spelling of 265077400661 in words is "two hundred sixty-five billion, seventy-seven million, four hundred thousand, six hundred sixty-one".