77469139442 has 54 divisors (see below), whose sum is σ = 124994523087. Its totient is φ = 36006966072.

The previous prime is 77469139421. The next prime is 77469139453. The reversal of 77469139442 is 24493196477.

It can be written as a sum of positive squares in only one way, i.e., 38734569721 + 38734569721 = 196811^2 + 196811^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=196811.

It is a super-3 number, since 3×77469139442³ (a number of 34 digits) contains 333 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 389292059 + ... + 389292257.

Almost surely, 2^77469139442 is an apocalyptic number.

77469139442 is a deficient number, since it is larger than the sum of its proper divisors (47525383645).

77469139442 is an equidigital number, since it uses as much as digits as its factorization.

77469139442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 532 (or 267 counting only the distinct ones).

The product of its digits is 9144576, while the sum is 56.

The spelling of 77469139442 in words is "seventy-seven billion, four hundred sixty-nine million, one hundred thirty-nine thousand, four hundred forty-two".