77918515016 has 16 divisors (see below), whose sum is σ = 146291763840. Its totient is φ = 38907378000.

The previous prime is 77918515013. The next prime is 77918515019. The reversal of 77918515016 is 61051581977.

It is an interprime number because it is at equal distance from previous prime (77918515013) and next prime (77918515019).

It is not an unprimeable number, because it can be changed into a prime (77918515013) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6478556 + ... + 6490571.

It is an arithmetic number, because the mean of its divisors is an integer number (9143235240).

Almost surely, 2^77918515016 is an apocalyptic number.

It is an amenable number.

77918515016 is a deficient number, since it is larger than the sum of its proper divisors (68373248824).

77918515016 is a wasteful number, since it uses less digits than its factorization.

77918515016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12969884 (or 12969880 counting only the distinct ones).

The product of its (nonzero) digits is 529200, while the sum is 50.

The spelling of 77918515016 in words is "seventy-seven billion, nine hundred eighteen million, five hundred fifteen thousand, sixteen".