77431555941 has 4 divisors (see below), whose sum is σ = 103242074592. Its totient is φ = 51621037292.

The previous prime is 77431555897. The next prime is 77431555951. The reversal of 77431555941 is 14955513477.

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 77431555941 - 2¹⁵ = 77431523173 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77431555951) 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, 12905259321 + ... + 12905259326.

It is an arithmetic number, because the mean of its divisors is an integer number (25810518648).

Almost surely, 2^77431555941 is an apocalyptic number.

It is an amenable number.

77431555941 is a deficient number, since it is larger than the sum of its proper divisors (25810518651).

77431555941 is a wasteful number, since it uses less digits than its factorization.

77431555941 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25810518650.

The product of its digits is 2646000, while the sum is 51.

The spelling of 77431555941 in words is "seventy-seven billion, four hundred thirty-one million, five hundred fifty-five thousand, nine hundred forty-one".