77464646477 has 4 divisors (see below), whose sum is σ = 77675722176. Its totient is φ = 77253570780.

The previous prime is 77464646471. The next prime is 77464646509.

It is a happy number.

77464646477 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 not a de Polignac number, because 77464646477 - 2³² = 73169679181 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 (77464646471) 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, 105537299 + ... + 105538032.

It is an arithmetic number, because the mean of its divisors is an integer number (19418930544).

Almost surely, 2^77464646477 is an apocalyptic number.

It is an amenable number.

77464646477 is a deficient number, since it is larger than the sum of its proper divisors (211075699).

77464646477 is a wasteful number, since it uses less digits than its factorization.

77464646477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211075698.

The product of its digits is 132765696, while the sum is 62.

The spelling of 77464646477 in words is "seventy-seven billion, four hundred sixty-four million, six hundred forty-six thousand, four hundred seventy-seven".