261677120077 has 4 divisors (see below), whose sum is σ = 262719658656. Its totient is φ = 260634581500.

The previous prime is 261677120071. The next prime is 261677120119. The reversal of 261677120077 is 770021776162.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 261677120077 - 2³ = 261677120069 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 (261677120071) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 521268913 + ... + 521269414.

It is an arithmetic number, because the mean of its divisors is an integer number (65679914664).

Almost surely, 2^261677120077 is an apocalyptic number.

It is an amenable number.

261677120077 is a deficient number, since it is larger than the sum of its proper divisors (1042538579).

261677120077 is a wasteful number, since it uses less digits than its factorization.

261677120077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1042538578.

The product of its (nonzero) digits is 345744, while the sum is 46.

The spelling of 261677120077 in words is "two hundred sixty-one billion, six hundred seventy-seven million, one hundred twenty thousand, seventy-seven".