19651555230 has 16 divisors (see below), whose sum is σ = 47163732624. Its totient is φ = 5240414720.

The previous prime is 19651555219. The next prime is 19651555237. The reversal of 19651555230 is 3255515691.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19651555237) 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, 327525891 + ... + 327525950.

It is an arithmetic number, because the mean of its divisors is an integer number (2947733289).

Almost surely, 2^19651555230 is an apocalyptic number.

19651555230 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19651555230 is an abundant number, since it is smaller than the sum of its proper divisors (27512177394).

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

19651555230 is a wasteful number, since it uses less digits than its factorization.

19651555230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 655051851.

The product of its (nonzero) digits is 202500, while the sum is 42.

The spelling of 19651555230 in words is "nineteen billion, six hundred fifty-one million, five hundred fifty-five thousand, two hundred thirty".