77646044698 has 16 divisors (see below), whose sum is σ = 123325350120. Its totient is φ = 36537785856.

The previous prime is 77646044687. The next prime is 77646044699. The reversal of 77646044698 is 89644064677.

It can be written as a sum of positive squares in 4 ways, for example, as 45568160089 + 32077884609 = 213467^2 + 179103^2 .

It is a super-2 number, since 2×77646044698² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (77646044699) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1582990 + ... + 1631302.

Almost surely, 2^77646044698 is an apocalyptic number.

77646044698 is a deficient number, since it is larger than the sum of its proper divisors (45679305422).

77646044698 is a wasteful number, since it uses less digits than its factorization.

77646044698 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95601.

The product of its (nonzero) digits is 48771072, while the sum is 61.

The spelling of 77646044698 in words is "seventy-seven billion, six hundred forty-six million, forty-four thousand, six hundred ninety-eight".