18691669772 has 6 divisors (see below), whose sum is σ = 32710422108. Its totient is φ = 9345834884.

The previous prime is 18691669753. The next prime is 18691669793. The reversal of 18691669772 is 27796619681.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2336458718 + ... + 2336458725.

It is an arithmetic number, because the mean of its divisors is an integer number (5451737018).

Almost surely, 2^18691669772 is an apocalyptic number.

It is an amenable number.

18691669772 is a deficient number, since it is larger than the sum of its proper divisors (14018752336).

18691669772 is a wasteful number, since it uses less digits than its factorization.

18691669772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4672917447 (or 4672917445 counting only the distinct ones).

The product of its digits is 13716864, while the sum is 62.

The spelling of 18691669772 in words is "eighteen billion, six hundred ninety-one million, six hundred sixty-nine thousand, seven hundred seventy-two".