77857488701616 has 80 divisors (see below), whose sum is σ = 216605472473600. Its totient is φ = 23955935120640.

The previous prime is 77857488701611. The next prime is 77857488701651. The reversal of 77857488701616 is 61610788475877.

It is a super-2 number, since 2×77857488701616² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (77857488701611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77688681 + ... + 78684471.

It is an arithmetic number, because the mean of its divisors is an integer number (2707568405920).

Almost surely, 2^{77857488701616} is an apocalyptic number.

It is an amenable number.

77857488701616 is an abundant number, since it is smaller than the sum of its proper divisors (138747983771984).

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

77857488701616 is a wasteful number, since it uses less digits than its factorization.

77857488701616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1121114 (or 1121108 counting only the distinct ones).

The product of its (nonzero) digits is 885104640, while the sum is 75.

The spelling of 77857488701616 in words is "seventy-seven trillion, eight hundred fifty-seven billion, four hundred eighty-eight million, seven hundred one thousand, six hundred sixteen".