77861555394 has 32 divisors (see below), whose sum is σ = 182779253376. Its totient is φ = 21644910720.

The previous prime is 77861555383. The next prime is 77861555417. The reversal of 77861555394 is 49355516877.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25050427 + ... + 25053534.

It is an arithmetic number, because the mean of its divisors is an integer number (5711851668).

Almost surely, 2^77861555394 is an apocalyptic number.

77861555394 is a gapful number since it is divisible by the number (74) formed by its first and last digit.

77861555394 is an abundant number, since it is smaller than the sum of its proper divisors (104917697982).

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

77861555394 is a wasteful number, since it uses less digits than its factorization.

77861555394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50104010.

The product of its digits is 31752000, while the sum is 60.

The spelling of 77861555394 in words is "seventy-seven billion, eight hundred sixty-one million, five hundred fifty-five thousand, three hundred ninety-four".