77747351680668 has 12 divisors (see below), whose sum is σ = 181410487254920. Its totient is φ = 25915783893552.

The previous prime is 77747351680667. The next prime is 77747351680717. The reversal of 77747351680668 is 86608615374777.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 77747351680668.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77747351680667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3239472986683 + ... + 3239472986706.

Almost surely, 2^{77747351680668} is an apocalyptic number.

It is an amenable number.

77747351680668 is an abundant number, since it is smaller than the sum of its proper divisors (103663135574252).

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

77747351680668 is a wasteful number, since it uses less digits than its factorization.

77747351680668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6478945973396 (or 6478945973394 counting only the distinct ones).

The product of its (nonzero) digits is 1991485440, while the sum is 75.

The spelling of 77747351680668 in words is "seventy-seven trillion, seven hundred forty-seven billion, three hundred fifty-one million, six hundred eighty thousand, six hundred sixty-eight".