77809544946 has 40 divisors (see below), whose sum is σ = 199258308480. Its totient is φ = 22231298232.

The previous prime is 77809544927. The next prime is 77809544947. The reversal of 77809544946 is 64944590877.

77809544946 is a `hidden beast` number, since 7 + 7 + 80 + 9 + 544 + 9 + 4 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (77809544947) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 34306426 + ... + 34308693.

It is an arithmetic number, because the mean of its divisors is an integer number (4981457712).

Almost surely, 2^77809544946 is an apocalyptic number.

77809544946 is an abundant number, since it is smaller than the sum of its proper divisors (121448763534).

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

77809544946 is a wasteful number, since it uses less digits than its factorization.

77809544946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68615140 (or 68615131 counting only the distinct ones).

The product of its (nonzero) digits is 60963840, while the sum is 63.

The spelling of 77809544946 in words is "seventy-seven billion, eight hundred nine million, five hundred forty-four thousand, nine hundred forty-six".