77431613477 has 4 divisors (see below), whose sum is σ = 77665546176. Its totient is φ = 77197680780.

The previous prime is 77431613459. The next prime is 77431613491.

77431613477 is nontrivially palindromic in base 10.

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 a de Polignac number, because none of the positive numbers 2^k-77431613477 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 (77431612477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 116965853 + ... + 116966514.

It is an arithmetic number, because the mean of its divisors is an integer number (19416386544).

Almost surely, 2^77431613477 is an apocalyptic number.

It is an amenable number.

77431613477 is a deficient number, since it is larger than the sum of its proper divisors (233932699).

77431613477 is a wasteful number, since it uses less digits than its factorization.

77431613477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233932698.

The product of its digits is 2074464, while the sum is 50.

The spelling of 77431613477 in words is "seventy-seven billion, four hundred thirty-one million, six hundred thirteen thousand, four hundred seventy-seven".