18616878646 has 8 divisors (see below), whose sum is σ = 28065646800. Its totient is φ = 9261663048.

The previous prime is 18616878617. The next prime is 18616878667. The reversal of 18616878646 is 64687861681.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23387641 + ... + 23388436.

It is an arithmetic number, because the mean of its divisors is an integer number (3508205850).

Almost surely, 2^18616878646 is an apocalyptic number.

18616878646 is a deficient number, since it is larger than the sum of its proper divisors (9448768154).

18616878646 is a wasteful number, since it uses less digits than its factorization.

18616878646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46776278.

The product of its digits is 18579456, while the sum is 61.

The spelling of 18616878646 in words is "eighteen billion, six hundred sixteen million, eight hundred seventy-eight thousand, six hundred forty-six".