77638774466 has 8 divisors (see below), whose sum is σ = 127045267344. Its totient is φ = 35290352020.

The previous prime is 77638774391. The next prime is 77638774469. The reversal of 77638774466 is 66447783677.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (77638774469) 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, 1764517580 + ... + 1764517623.

It is an arithmetic number, because the mean of its divisors is an integer number (15880658418).

Almost surely, 2^77638774466 is an apocalyptic number.

77638774466 is a deficient number, since it is larger than the sum of its proper divisors (49406492878).

77638774466 is a wasteful number, since it uses less digits than its factorization.

77638774466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3529035216.

The product of its digits is 199148544, while the sum is 65.

The spelling of 77638774466 in words is "seventy-seven billion, six hundred thirty-eight million, seven hundred seventy-four thousand, four hundred sixty-six".