265077400681 has 2 divisors, whose sum is σ = 265077400682. Its totient is φ = 265077400680.

The previous prime is 265077400661. The next prime is 265077400697. The reversal of 265077400681 is 186004770562.

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., 262819250281 + 2258150400 = 512659^2 + 47520^2 .

It is a cyclic number.

It is not a de Polignac number, because 265077400681 - 2¹⁵ = 265077367913 is a prime.

It is a super-2 number, since 2×265077400681² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (265077400661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132538700340 + 132538700341.

It is an arithmetic number, because the mean of its divisors is an integer number (132538700341).

Almost surely, 2^265077400681 is an apocalyptic number.

It is an amenable number.

265077400681 is a deficient number, since it is larger than the sum of its proper divisors (1).

265077400681 is an equidigital number, since it uses as much as digits as its factorization.

265077400681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 564480, while the sum is 46.

The spelling of 265077400681 in words is "two hundred sixty-five billion, seventy-seven million, four hundred thousand, six hundred eighty-one".