261396076077 has 32 divisors (see below), whose sum is σ = 388477798400. Its totient is φ = 173713849344.

The previous prime is 261396076037. The next prime is 261396076153. The reversal of 261396076077 is 770670693162.

261396076077 is a `hidden beast` number, since 26 + 1 + 3 + 9 + 6 + 0 + 7 + 607 + 7 = 666.

It is not a de Polignac number, because 261396076077 - 2¹⁶ = 261396010541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261396076027) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13402749 + ... + 13422237.

It is an arithmetic number, because the mean of its divisors is an integer number (12139931200).

Almost surely, 2^261396076077 is an apocalyptic number.

261396076077 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

261396076077 is a deficient number, since it is larger than the sum of its proper divisors (127081722323).

261396076077 is a wasteful number, since it uses less digits than its factorization.

261396076077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21042 (or 21036 counting only the distinct ones).

The product of its (nonzero) digits is 4000752, while the sum is 54.

The spelling of 261396076077 in words is "two hundred sixty-one billion, three hundred ninety-six million, seventy-six thousand, seventy-seven".