19655093640 has 512 divisors, whose sum is σ = 74954880000. Its totient is φ = 4096770048.

The previous prime is 19655093573. The next prime is 19655093641. The reversal of 19655093640 is 4639055691.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 19655093640.

It is not an unprimeable number, because it can be changed into a prime (19655093641) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 58323552 + ... + 58323888.

It is an arithmetic number, because the mean of its divisors is an integer number (146396250).

Almost surely, 2^19655093640 is an apocalyptic number.

19655093640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19655093640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37477440000).

19655093640 is an abundant number, since it is smaller than the sum of its proper divisors (55299786360).

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

19655093640 is a wasteful number, since it uses less digits than its factorization.

19655093640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 494 (or 476 counting only the distinct ones).

The product of its (nonzero) digits is 874800, while the sum is 48.

The spelling of 19655093640 in words is "nineteen billion, six hundred fifty-five million, ninety-three thousand, six hundred forty".