77426533770664 has 32 divisors (see below), whose sum is σ = 157889980349640. Its totient is φ = 35381508192000.

The previous prime is 77426533770583. The next prime is 77426533770709. The reversal of 77426533770664 is 46607733562477.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 62932964980900 + 14493568789764 = 7933030^2 + 3807042^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 77426533770664.

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, 3685563267 + ... + 3685584274.

Almost surely, 2^{77426533770664} is an apocalyptic number.

It is an amenable number.

77426533770664 is an abundant number, since it is smaller than the sum of its proper divisors (80463446578976).

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

77426533770664 is a wasteful number, since it uses less digits than its factorization.

77426533770664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7371147661 (or 7371147657 counting only the distinct ones).

The product of its (nonzero) digits is 746807040, while the sum is 67.

The spelling of 77426533770664 in words is "seventy-seven trillion, four hundred twenty-six billion, five hundred thirty-three million, seven hundred seventy thousand, six hundred sixty-four".