77421612477 has 12 divisors (see below), whose sum is σ = 113466385760. Its totient is φ = 46922189160.

The previous prime is 77421612391. The next prime is 77421612491.

77421612477 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 77421612477 - 2¹⁶ = 77421546941 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 (77421612077) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 106640977 + ... + 106641702.

Almost surely, 2^77421612477 is an apocalyptic number.

It is an amenable number.

77421612477 is a deficient number, since it is larger than the sum of its proper divisors (36044773283).

77421612477 is a wasteful number, since it uses less digits than its factorization.

77421612477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213282704 (or 213282693 counting only the distinct ones).

The product of its digits is 921984, while the sum is 48.

The spelling of 77421612477 in words is "seventy-seven billion, four hundred twenty-one million, six hundred twelve thousand, four hundred seventy-seven".