77766664890 has 32 divisors (see below), whose sum is σ = 186811776000. Its totient is φ = 20718690624.

The previous prime is 77766664847. The next prime is 77766664891. The reversal of 77766664890 is 9846666777.

It is a super-4 number, since 4×77766664890⁴ (a number of 45 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (77766664891) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1159765 + ... + 1224984.

It is an arithmetic number, because the mean of its divisors is an integer number (5837868000).

Almost surely, 2^77766664890 is an apocalyptic number.

77766664890 is an abundant number, since it is smaller than the sum of its proper divisors (109045111110).

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

77766664890 is a wasteful number, since it uses less digits than its factorization.

77766664890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2385846.

The product of its (nonzero) digits is 128024064, while the sum is 66.

The spelling of 77766664890 in words is "seventy-seven billion, seven hundred sixty-six million, six hundred sixty-four thousand, eight hundred ninety".