1566949899 has 8 divisors (see below), whose sum is σ = 2094723072. Its totient is φ = 1041905000.

The previous prime is 1566949877. The next prime is 1566949949. The reversal of 1566949899 is 9989496651.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1566949899 - 2¹³ = 1566941707 is a prime.

It is a super-2 number, since 2×1566949899² = 4910663971952220402, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1566949829) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 680727 + ... + 683024.

It is an arithmetic number, because the mean of its divisors is an integer number (261840384).

Almost surely, 2^1566949899 is an apocalyptic number.

1566949899 is a deficient number, since it is larger than the sum of its proper divisors (527773173).

1566949899 is a wasteful number, since it uses less digits than its factorization.

1566949899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1364137.

The product of its digits is 37791360, while the sum is 66.

The square root of 1566949899 is about 39584.7179982377. The cubic root of 1566949899 is about 1161.4977430601.

The spelling of 1566949899 in words is "one billion, five hundred sixty-six million, nine hundred forty-nine thousand, eight hundred ninety-nine".