1790661553 has 2 divisors, whose sum is σ = 1790661554. Its totient is φ = 1790661552.

The previous prime is 1790661461. The next prime is 1790661581. The reversal of 1790661553 is 3551660971.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1788190369 + 2471184 = 42287^2 + 1572^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1790661553 is a prime.

It is not a weakly prime, because it can be changed into another prime (1790661853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 895330776 + 895330777.

It is an arithmetic number, because the mean of its divisors is an integer number (895330777).

Almost surely, 2^1790661553 is an apocalyptic number.

It is an amenable number.

1790661553 is a deficient number, since it is larger than the sum of its proper divisors (1).

1790661553 is an equidigital number, since it uses as much as digits as its factorization.

1790661553 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 170100, while the sum is 43.

The square root of 1790661553 is about 42316.2091047863. The cubic root of 1790661553 is about 1214.3331091595. Note that the first 3 decimals are identical.

The spelling of 1790661553 in words is "one billion, seven hundred ninety million, six hundred sixty-one thousand, five hundred fifty-three".