77718431552 has 14 divisors (see below), whose sum is σ = 154222512738. Its totient is φ = 38859215744.

The previous prime is 77718431551. The next prime is 77718431629. The reversal of 77718431552 is 25513481777.

It can be written as a sum of positive squares in only one way, i.e., 77698217536 + 20214016 = 278744^2 + 4496^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 77718431552.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77718431551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 607175183 + ... + 607175310.

It is an arithmetic number, because the mean of its divisors is an integer number (11015893767).

Almost surely, 2^77718431552 is an apocalyptic number.

It is an amenable number.

77718431552 is a deficient number, since it is larger than the sum of its proper divisors (76504081186).

77718431552 is a wasteful number, since it uses less digits than its factorization.

77718431552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1214350505 (or 1214350495 counting only the distinct ones).

The product of its digits is 1646400, while the sum is 50.

The spelling of 77718431552 in words is "seventy-seven billion, seven hundred eighteen million, four hundred thirty-one thousand, five hundred fifty-two".