19866525064 has 32 divisors (see below), whose sum is σ = 37348646400. Its totient is φ = 9906926400.

The previous prime is 19866525043. The next prime is 19866525071. The reversal of 19866525064 is 46052566891.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6094267 + ... + 6097525.

It is an arithmetic number, because the mean of its divisors is an integer number (1167145200).

Almost surely, 2^19866525064 is an apocalyptic number.

It is an amenable number.

19866525064 is a deficient number, since it is larger than the sum of its proper divisors (17482121336).

19866525064 is a wasteful number, since it uses less digits than its factorization.

19866525064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5053 (or 5049 counting only the distinct ones).

The product of its (nonzero) digits is 3110400, while the sum is 52.

It can be divided in two parts, 198665 and 25064, that added together give a square (223729 = 473²).

The spelling of 19866525064 in words is "nineteen billion, eight hundred sixty-six million, five hundred twenty-five thousand, sixty-four".