19758681690 has 128 divisors (see below), whose sum is σ = 53049738240. Its totient is φ = 4708235840.

The previous prime is 19758681659. The next prime is 19758681713. The reversal of 19758681690 is 9618685791.

It is a super-2 number, since 2×19758681690² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2351677 + ... + 2360063.

It is an arithmetic number, because the mean of its divisors is an integer number (414451080).

Almost surely, 2^19758681690 is an apocalyptic number.

19758681690 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 19758681690, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26524869120).

19758681690 is an abundant number, since it is smaller than the sum of its proper divisors (33291056550).

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

19758681690 is a wasteful number, since it uses less digits than its factorization.

19758681690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8489 (or 8467 counting only the distinct ones).

The product of its (nonzero) digits is 6531840, while the sum is 60.

The spelling of 19758681690 in words is "nineteen billion, seven hundred fifty-eight million, six hundred eighty-one thousand, six hundred ninety".