77788668466664 has 16 divisors (see below), whose sum is σ = 148244798513220. Its totient is φ = 38256722196480.

The previous prime is 77788668466657. The next prime is 77788668466753. The reversal of 77788668466664 is 46666486688777.

It can be written as a sum of positive squares in 2 ways, for example, as 77774020205764 + 14648260900 = 8818958^2 + 121030^2 .

It is a super-2 number, since 2×77788668466664² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 77788668466664.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79701504089 + ... + 79701505064.

Almost surely, 2^{77788668466664} is an apocalyptic number.

It is an amenable number.

77788668466664 is a deficient number, since it is larger than the sum of its proper divisors (70456130046556).

77788668466664 is a wasteful number, since it uses less digits than its factorization.

77788668466664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159403009220 (or 159403009216 counting only the distinct ones).

The product of its digits is 131096641536, while the sum is 89.

The spelling of 77788668466664 in words is "seventy-seven trillion, seven hundred eighty-eight billion, six hundred sixty-eight million, four hundred sixty-six thousand, six hundred sixty-four".