18877655616 has 56 divisors (see below), whose sum is σ = 50413980960. Its totient is φ = 6233736192.

The previous prime is 18877655603. The next prime is 18877655617. The reversal of 18877655616 is 61655677881.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 18877655616.

It is not an unprimeable number, because it can be changed into a prime (18877655617) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 438901 + ... + 479988.

It is an arithmetic number, because the mean of its divisors is an integer number (900249660).

Almost surely, 2^18877655616 is an apocalyptic number.

18877655616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18877655616 is an abundant number, since it is smaller than the sum of its proper divisors (31536325344).

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

18877655616 is a wasteful number, since it uses less digits than its factorization.

18877655616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 919011 (or 919001 counting only the distinct ones).

The product of its digits is 16934400, while the sum is 60.

The spelling of 18877655616 in words is "eighteen billion, eight hundred seventy-seven million, six hundred fifty-five thousand, six hundred sixteen".