77654551261 has 8 divisors (see below), whose sum is σ = 88753710080. Its totient is φ = 66556805328.

The previous prime is 77654551231. The next prime is 77654551279. The reversal of 77654551261 is 16215545677.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 77654551261 - 2⁵ = 77654551229 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77654551211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 232701 + ... + 457666.

It is an arithmetic number, because the mean of its divisors is an integer number (11094213760).

Almost surely, 2^77654551261 is an apocalyptic number.

It is an amenable number.

77654551261 is a deficient number, since it is larger than the sum of its proper divisors (11099158819).

77654551261 is a wasteful number, since it uses less digits than its factorization.

77654551261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 706443.

The product of its digits is 1764000, while the sum is 49.

The spelling of 77654551261 in words is "seventy-seven billion, six hundred fifty-four million, five hundred fifty-one thousand, two hundred sixty-one".