1992880661 has 2 divisors, whose sum is σ = 1992880662. Its totient is φ = 1992880660.

The previous prime is 1992880657. The next prime is 1992880679. The reversal of 1992880661 is 1660882991.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1749832561 + 243048100 = 41831^2 + 15590^2 .

It is an emirp because it is prime and its reverse (1660882991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1992880661 - 2² = 1992880657 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1992880621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 996440330 + 996440331.

It is an arithmetic number, because the mean of its divisors is an integer number (996440331).

Almost surely, 2^1992880661 is an apocalyptic number.

It is an amenable number.

1992880661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1992880661 is an equidigital number, since it uses as much as digits as its factorization.

1992880661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 373248, while the sum is 50.

The square root of 1992880661 is about 44641.6919594229. The cubic root of 1992880661 is about 1258.4243050039.

The spelling of 1992880661 in words is "one billion, nine hundred ninety-two million, eight hundred eighty thousand, six hundred sixty-one".