1662080621 has 2 divisors, whose sum is σ = 1662080622. Its totient is φ = 1662080620.

The previous prime is 1662080573. The next prime is 1662080639. The reversal of 1662080621 is 1260802661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 995718025 + 666362596 = 31555^2 + 25814^2 .

It is a cyclic number.

It is not a de Polignac number, because 1662080621 - 2⁶ = 1662080557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1662088621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 831040310 + 831040311.

It is an arithmetic number, because the mean of its divisors is an integer number (831040311).

Almost surely, 2^1662080621 is an apocalyptic number.

It is an amenable number.

1662080621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1662080621 is an equidigital number, since it uses as much as digits as its factorization.

1662080621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 1662080621 is about 40768.6229961229. The cubic root of 1662080621 is about 1184.5426308551.

The spelling of 1662080621 in words is "one billion, six hundred sixty-two million, eighty thousand, six hundred twenty-one".