18729691722 has 80 divisors (see below), whose sum is σ = 48241619712. Its totient is φ = 5320352160.

The previous prime is 18729691711. The next prime is 18729691723. The reversal of 18729691722 is 22719692781.

18729691722 is a `hidden beast` number, since 187 + 296 + 9 + 172 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (18729691723) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 148447 + ... + 243917.

Almost surely, 2^18729691722 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18729691722, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24120809856).

18729691722 is an abundant number, since it is smaller than the sum of its proper divisors (29511927990).

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

18729691722 is a wasteful number, since it uses less digits than its factorization.

18729691722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95665 (or 95656 counting only the distinct ones).

The product of its digits is 1524096, while the sum is 54.

The spelling of 18729691722 in words is "eighteen billion, seven hundred twenty-nine million, six hundred ninety-one thousand, seven hundred twenty-two".