19654690000 has 200 divisors, whose sum is σ = 52233005088. Its totient is φ = 7103040000.

The previous prime is 19654689953. The next prime is 19654690007. The reversal of 19654690000 is 9645691.

It is a tau number, because it is divible by the number of its divisors (200).

It is a super-2 number, since 2×19654690000² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19654690007) by changing a digit.

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 39 ways as a sum of consecutive naturals, for example, 21669547 + ... + 21670453.

Almost surely, 2^19654690000 is an apocalyptic number.

19654690000 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 19654690000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26116502544).

19654690000 is an abundant number, since it is smaller than the sum of its proper divisors (32578315088).

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

19654690000 is a wasteful number, since it uses less digits than its factorization.

19654690000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1143 (or 1122 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 40.

The spelling of 19654690000 in words is "nineteen billion, six hundred fifty-four million, six hundred ninety thousand".