1621664170716 has 12 divisors (see below), whose sum is σ = 3783883065032. Its totient is φ = 540554723568.

The previous prime is 1621664170681. The next prime is 1621664170723. The reversal of 1621664170716 is 6170714661261.

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

It is a congruent number.

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, 67569340435 + ... + 67569340458.

Almost surely, 2^{1621664170716} is an apocalyptic number.

It is an amenable number.

1621664170716 is an abundant number, since it is smaller than the sum of its proper divisors (2162218894316).

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

1621664170716 is a wasteful number, since it uses less digits than its factorization.

1621664170716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135138680900 (or 135138680898 counting only the distinct ones).

The product of its (nonzero) digits is 508032, while the sum is 48.

The spelling of 1621664170716 in words is "one trillion, six hundred twenty-one billion, six hundred sixty-four million, one hundred seventy thousand, seven hundred sixteen".