19665664861704 has 64 divisors (see below), whose sum is σ = 49719671942400. Its totient is φ = 6481162845696.

The previous prime is 19665664861693. The next prime is 19665664861807. The reversal of 19665664861704 is 40716846656691.

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, 34949937 + ... + 35508159.

It is an arithmetic number, because the mean of its divisors is an integer number (776869874100).

Almost surely, 2^{19665664861704} is an apocalyptic number.

It is an amenable number.

19665664861704 is an abundant number, since it is smaller than the sum of its proper divisors (30054007080696).

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

19665664861704 is a wasteful number, since it uses less digits than its factorization.

19665664861704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 574814 (or 574810 counting only the distinct ones).

The product of its (nonzero) digits is 313528320, while the sum is 69.

The spelling of 19665664861704 in words is "nineteen trillion, six hundred sixty-five billion, six hundred sixty-four million, eight hundred sixty-one thousand, seven hundred four".