1999566457 has 16 divisors (see below), whose sum is σ = 2334977280. Its totient is φ = 1676780352.

The previous prime is 1999566451. The next prime is 1999566461. The reversal of 1999566457 is 7546659991.

It is a cyclic number.

It is not a de Polignac number, because 1999566457 - 2²³ = 1991177849 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1999566395 and 1999566404.

It is not an unprimeable number, because it can be changed into a prime (1999566451) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 125683 + ... + 140695.

It is an arithmetic number, because the mean of its divisors is an integer number (145936080).

Almost surely, 2^1999566457 is an apocalyptic number.

It is an amenable number.

1999566457 is a deficient number, since it is larger than the sum of its proper divisors (335410823).

1999566457 is a wasteful number, since it uses less digits than its factorization.

1999566457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15432.

The product of its digits is 18370800, while the sum is 61.

The square root of 1999566457 is about 44716.5121291900. The cubic root of 1999566457 is about 1259.8300049906.

The spelling of 1999566457 in words is "one billion, nine hundred ninety-nine million, five hundred sixty-six thousand, four hundred fifty-seven".