19455020556 has 24 divisors (see below), whose sum is σ = 45401173104. Its totient is φ = 6484131840.

The previous prime is 19455020551. The next prime is 19455020567. The reversal of 19455020556 is 65502055491.

It is not an unprimeable number, because it can be changed into a prime (19455020551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13365 + ... + 197708.

It is an arithmetic number, because the mean of its divisors is an integer number (1891715546).

Almost surely, 2^19455020556 is an apocalyptic number.

It is an amenable number.

19455020556 is an abundant number, since it is smaller than the sum of its proper divisors (25946152548).

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

19455020556 is a wasteful number, since it uses less digits than its factorization.

19455020556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218761 (or 218759 counting only the distinct ones).

The product of its (nonzero) digits is 270000, while the sum is 42.

The spelling of 19455020556 in words is "nineteen billion, four hundred fifty-five million, twenty thousand, five hundred fifty-six".