19540621596 has 48 divisors (see below), whose sum is σ = 46885819680. Its totient is φ = 6329548800.

The previous prime is 19540621571. The next prime is 19540621603. The reversal of 19540621596 is 69512604591.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 331996 + ... + 386396.

It is an arithmetic number, because the mean of its divisors is an integer number (976787910).

Almost surely, 2^19540621596 is an apocalyptic number.

It is an amenable number.

19540621596 is an abundant number, since it is smaller than the sum of its proper divisors (27345198084).

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

19540621596 is a wasteful number, since it uses less digits than its factorization.

19540621596 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55254 (or 55252 counting only the distinct ones).

The product of its (nonzero) digits is 583200, while the sum is 48.

The spelling of 19540621596 in words is "nineteen billion, five hundred forty million, six hundred twenty-one thousand, five hundred ninety-six".