18951441720 has 32 divisors (see below), whose sum is σ = 56854325520. Its totient is φ = 5053717760.

The previous prime is 18951441701. The next prime is 18951441727. The reversal of 18951441720 is 2714415981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18951441727) 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, 78964221 + ... + 78964460.

Almost surely, 2^18951441720 is an apocalyptic number.

18951441720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18951441720 is an abundant number, since it is smaller than the sum of its proper divisors (37902883800).

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

18951441720 is a wasteful number, since it uses less digits than its factorization.

18951441720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157928695 (or 157928691 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 42.

The spelling of 18951441720 in words is "eighteen billion, nine hundred fifty-one million, four hundred forty-one thousand, seven hundred twenty".