74639401639 has 6 divisors (see below), whose sum is σ = 82041656480. Its totient is φ = 67854001380.

The previous prime is 74639401633. The next prime is 74639401679. The reversal of 74639401639 is 93610493647.

It is not a de Polignac number, because 74639401639 - 2⁷ = 74639401511 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 (74639401633) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 308427159 + ... + 308427400.

Almost surely, 2^74639401639 is an apocalyptic number.

74639401639 is a deficient number, since it is larger than the sum of its proper divisors (7402254841).

74639401639 is a wasteful number, since it uses less digits than its factorization.

74639401639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 616854581 (or 616854570 counting only the distinct ones).

The product of its (nonzero) digits is 2939328, while the sum is 52.

The spelling of 74639401639 in words is "seventy-four billion, six hundred thirty-nine million, four hundred one thousand, six hundred thirty-nine".