77681771342 has 16 divisors (see below), whose sum is σ = 134992982112. Its totient is φ = 32836129920.

The previous prime is 77681771333. The next prime is 77681771353. The reversal of 77681771342 is 24317718677.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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, 38003759 + ... + 38005802.

It is an arithmetic number, because the mean of its divisors is an integer number (8437061382).

Almost surely, 2^77681771342 is an apocalyptic number.

77681771342 is a deficient number, since it is larger than the sum of its proper divisors (57311210770).

77681771342 is a wasteful number, since it uses less digits than its factorization.

77681771342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76009643.

The product of its digits is 2765952, while the sum is 53.

The spelling of 77681771342 in words is "seventy-seven billion, six hundred eighty-one million, seven hundred seventy-one thousand, three hundred forty-two".