77849064642 has 16 divisors (see below), whose sum is σ = 157668992640. Its totient is φ = 25621210992.

The previous prime is 77849064641. The next prime is 77849064677. The reversal of 77849064642 is 24646094877.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (77849064641) 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, 82118793 + ... + 82119740.

It is an arithmetic number, because the mean of its divisors is an integer number (9854312040).

Almost surely, 2^77849064642 is an apocalyptic number.

77849064642 is an abundant number, since it is smaller than the sum of its proper divisors (79819927998).

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

77849064642 is a wasteful number, since it uses less digits than its factorization.

77849064642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164238617.

The product of its (nonzero) digits is 16257024, while the sum is 57.

The spelling of 77849064642 in words is "seventy-seven billion, eight hundred forty-nine million, sixty-four thousand, six hundred forty-two".