77654551231 has 2 divisors, whose sum is σ = 77654551232. Its totient is φ = 77654551230.

The previous prime is 77654551229. The next prime is 77654551279. The reversal of 77654551231 is 13215545677.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 77654551231 - 2¹ = 77654551229 is a prime.

It is a super-2 number, since 2×77654551231² (a number of 23 digits) contains 22 as substring.

Together with 77654551229, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77654551211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38827275615 + 38827275616.

It is an arithmetic number, because the mean of its divisors is an integer number (38827275616).

Almost surely, 2^77654551231 is an apocalyptic number.

77654551231 is a deficient number, since it is larger than the sum of its proper divisors (1).

77654551231 is an equidigital number, since it uses as much as digits as its factorization.

77654551231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 882000, while the sum is 46.

The spelling of 77654551231 in words is "seventy-seven billion, six hundred fifty-four million, five hundred fifty-one thousand, two hundred thirty-one".