5661912499 has 2 divisors, whose sum is σ = 5661912500. Its totient is φ = 5661912498.

The previous prime is 5661912493. The next prime is 5661912539. The reversal of 5661912499 is 9942191665.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 5661912499 - 2⁷ = 5661912371 is a prime.

It is not a weakly prime, because it can be changed into another prime (5661912493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2830956249 + 2830956250.

It is an arithmetic number, because the mean of its divisors is an integer number (2830956250).

Almost surely, 2^5661912499 is an apocalyptic number.

5661912499 is a deficient number, since it is larger than the sum of its proper divisors (1).

5661912499 is an equidigital number, since it uses as much as digits as its factorization.

5661912499 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1049760, while the sum is 52.

The square root of 5661912499 is about 75245.6809325293. The cubic root of 5661912499 is about 1782.3283609838.

The spelling of 5661912499 in words is "five billion, six hundred sixty-one million, nine hundred twelve thousand, four hundred ninety-nine".