77421430646 has 16 divisors (see below), whose sum is σ = 133063650720. Its totient is φ = 33095313600.

The previous prime is 77421430631. The next prime is 77421430721. The reversal of 77421430646 is 64603412477.

It is a junction number, because it is equal to n+sod(n) for n = 77421430597 and 77421430606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7102655 + ... + 7113546.

It is an arithmetic number, because the mean of its divisors is an integer number (8316478170).

Almost surely, 2^77421430646 is an apocalyptic number.

77421430646 is a deficient number, since it is larger than the sum of its proper divisors (55642220074).

77421430646 is a wasteful number, since it uses less digits than its factorization.

77421430646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14216599.

The product of its (nonzero) digits is 677376, while the sum is 44.

The spelling of 77421430646 in words is "seventy-seven billion, four hundred twenty-one million, four hundred thirty thousand, six hundred forty-six".