77764030861638 has 16 divisors (see below), whose sum is σ = 169666976425536. Its totient is φ = 23564857836840.

The previous prime is 77764030861609. The next prime is 77764030861651. The reversal of 77764030861638 is 83616803046777.

It is a Harshad number since it is a multiple of its sum of digits (66), and also a Moran number because the ratio is a prime number: 1178242891843 = 77764030861638 / (7 + 7 + 7 + 6 + 4 + 0 + 3 + 0 + 8 + 6 + 1 + 6 + 3 + 8).

It is a Curzon 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, 589121445856 + ... + 589121445987.

It is an arithmetic number, because the mean of its divisors is an integer number (10604186026596).

Almost surely, 2^{77764030861638} is an apocalyptic number.

77764030861638 is an abundant number, since it is smaller than the sum of its proper divisors (91902945563898).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

77764030861638 is a wasteful number, since it uses less digits than its factorization.

77764030861638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1178242891859.

The product of its (nonzero) digits is 170698752, while the sum is 66.

The spelling of 77764030861638 in words is "seventy-seven trillion, seven hundred sixty-four billion, thirty million, eight hundred sixty-one thousand, six hundred thirty-eight".