1990456166293 has 32 divisors (see below), whose sum is σ = 2334989018880. Its totient is φ = 1661140224000.

The previous prime is 1990456166203. The next prime is 1990456166323. The reversal of 1990456166293 is 3926616540991.

It is a cyclic number.

It is not a de Polignac number, because 1990456166293 - 2²⁹ = 1989919295381 is a prime.

It is a Smith number, since the sum of its digits (61) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1990456166203) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 400572313 + ... + 400577281.

It is an arithmetic number, because the mean of its divisors is an integer number (72968406840).

Almost surely, 2^{1990456166293} is an apocalyptic number.

It is an amenable number.

1990456166293 is a deficient number, since it is larger than the sum of its proper divisors (344532852587).

1990456166293 is a wasteful number, since it uses less digits than its factorization.

1990456166293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7549.

The product of its (nonzero) digits is 18895680, while the sum is 61.

The spelling of 1990456166293 in words is "one trillion, nine hundred ninety billion, four hundred fifty-six million, one hundred sixty-six thousand, two hundred ninety-three".