5661912493 has 2 divisors, whose sum is σ = 5661912494. Its totient is φ = 5661912492.

The previous prime is 5661912463. The next prime is 5661912499. The reversal of 5661912493 is 3942191665.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4586269284 + 1075643209 = 67722^2 + 32797^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5661912493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5661912499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2830956246 + 2830956247.

It is an arithmetic number, because the mean of its divisors is an integer number (2830956247).

Almost surely, 2^5661912493 is an apocalyptic number.

It is an amenable number.

5661912493 is a deficient number, since it is larger than the sum of its proper divisors (1).

5661912493 is an equidigital number, since it uses as much as digits as its factorization.

5661912493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 349920, while the sum is 46.

The square root of 5661912493 is about 75245.6808926599. The cubic root of 5661912493 is about 1782.3283603542.

The spelling of 5661912493 in words is "five billion, six hundred sixty-one million, nine hundred twelve thousand, four hundred ninety-three".