19655797650 has 48 divisors (see below), whose sum is σ = 48886987104. Its totient is φ = 5226426880.

The previous prime is 19655797643. The next prime is 19655797663. The reversal of 19655797650 is 5679755691.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 136767 + ... + 240866.

It is an arithmetic number, because the mean of its divisors is an integer number (1018478898).

Almost surely, 2^19655797650 is an apocalyptic number.

19655797650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19655797650 is an abundant number, since it is smaller than the sum of its proper divisors (29231189454).

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

19655797650 is a wasteful number, since it uses less digits than its factorization.

19655797650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 377995 (or 377990 counting only the distinct ones).

The product of its (nonzero) digits is 17860500, while the sum is 60.

The spelling of 19655797650 in words is "nineteen billion, six hundred fifty-five million, seven hundred ninety-seven thousand, six hundred fifty".