77761784164 has 9 divisors (see below), whose sum is σ = 136084098297. Its totient is φ = 38880613224.

The previous prime is 77761784143. The next prime is 77761784173. The reversal of 77761784164 is 46148716777.

The square root of 77761784164 is 278858.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 5830544164 + 71931240000 = 76358^2 + 268200^2 .

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 77761784099 and 77761784108.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 488002 + ... + 627430.

Almost surely, 2^77761784164 is an apocalyptic number.

77761784164 is the 278858-th square number.

It is an amenable number.

77761784164 is a deficient number, since it is larger than the sum of its proper divisors (58322314133).

77761784164 is an frugal number, since it uses more digits than its factorization.

77761784164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278862 (or 139431 counting only the distinct ones).

The product of its digits is 11063808, while the sum is 58.

The spelling of 77761784164 in words is "seventy-seven billion, seven hundred sixty-one million, seven hundred eighty-four thousand, one hundred sixty-four".