1664719695204 has 12 divisors (see below), whose sum is σ = 3884345955504. Its totient is φ = 554906565064.

The previous prime is 1664719695181. The next prime is 1664719695239. The reversal of 1664719695204 is 4025969174661.

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

It is a Smith number, since the sum of its digits (60) coincides with the sum of the digits of its prime factors.

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, 69363320622 + ... + 69363320645.

It is an arithmetic number, because the mean of its divisors is an integer number (323695496292).

Almost surely, 2^{1664719695204} is an apocalyptic number.

It is an amenable number.

1664719695204 is an abundant number, since it is smaller than the sum of its proper divisors (2219626260300).

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

1664719695204 is a wasteful number, since it uses less digits than its factorization.

1664719695204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138726641274 (or 138726641272 counting only the distinct ones).

The product of its (nonzero) digits is 19595520, while the sum is 60.

The spelling of 1664719695204 in words is "one trillion, six hundred sixty-four billion, seven hundred nineteen million, six hundred ninety-five thousand, two hundred four".