18612161578 has 64 divisors (see below), whose sum is σ = 30990781440. Its totient is φ = 8346544128.

The previous prime is 18612161537. The next prime is 18612161587. The reversal of 18612161578 is 87516121681.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13614651 + ... + 13616017.

It is an arithmetic number, because the mean of its divisors is an integer number (484230960).

Almost surely, 2^18612161578 is an apocalyptic number.

18612161578 is a deficient number, since it is larger than the sum of its proper divisors (12378619862).

18612161578 is a wasteful number, since it uses less digits than its factorization.

18612161578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1639.

The product of its digits is 161280, while the sum is 46.

The spelling of 18612161578 in words is "eighteen billion, six hundred twelve million, one hundred sixty-one thousand, five hundred seventy-eight".