19597218690 has 128 divisors (see below), whose sum is σ = 56979417600. Its totient is φ = 4211048448.

The previous prime is 19597218689. The next prime is 19597218703. The reversal of 19597218690 is 9681279591.

It is a super-2 number, since 2×19597218690² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 19597218690.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3742314 + ... + 3747546.

It is an arithmetic number, because the mean of its divisors is an integer number (445151700).

Almost surely, 2^19597218690 is an apocalyptic number.

19597218690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 19597218690, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28489708800).

19597218690 is an abundant number, since it is smaller than the sum of its proper divisors (37382198910).

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

19597218690 is a wasteful number, since it uses less digits than its factorization.

19597218690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6316.

The product of its (nonzero) digits is 2449440, while the sum is 57.

The spelling of 19597218690 in words is "nineteen billion, five hundred ninety-seven million, two hundred eighteen thousand, six hundred ninety".