19755643956 has 12 divisors (see below), whose sum is σ = 46096502592. Its totient is φ = 6585214648.

The previous prime is 19755643949. The next prime is 19755643967. The reversal of 19755643956 is 65934655791.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 19755643956.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 823151820 + ... + 823151843.

It is an arithmetic number, because the mean of its divisors is an integer number (3841375216).

Almost surely, 2^19755643956 is an apocalyptic number.

It is an amenable number.

19755643956 is an abundant number, since it is smaller than the sum of its proper divisors (26340858636).

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

19755643956 is a wasteful number, since it uses less digits than its factorization.

19755643956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1646303670 (or 1646303668 counting only the distinct ones).

The product of its digits is 30618000, while the sum is 60.

The spelling of 19755643956 in words is "nineteen billion, seven hundred fifty-five million, six hundred forty-three thousand, nine hundred fifty-six".