77145815870 has 32 divisors (see below), whose sum is σ = 139452014016. Its totient is φ = 30727468800.

The previous prime is 77145815821. The next prime is 77145815897. The reversal of 77145815870 is 7851854177.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4478975 + ... + 4496165.

It is an arithmetic number, because the mean of its divisors is an integer number (4357875438).

Almost surely, 2^77145815870 is an apocalyptic number.

77145815870 is a deficient number, since it is larger than the sum of its proper divisors (62306198146).

77145815870 is a wasteful number, since it uses less digits than its factorization.

77145815870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19076.

The product of its (nonzero) digits is 2195200, while the sum is 53.

The spelling of 77145815870 in words is "seventy-seven billion, one hundred forty-five million, eight hundred fifteen thousand, eight hundred seventy".