166897899 has 12 divisors (see below), whose sum is σ = 275514096. Its totient is φ = 95370192.

The previous prime is 166897897. The next prime is 166897931. The reversal of 166897899 is 998798661.

It is not a de Polignac number, because 166897899 - 2¹ = 166897897 is a prime.

It is a super-2 number, since 2×166897899² = 55709817381228402, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63), and also a Moran number because the ratio is a prime number: 2649173 = 166897899 / (1 + 6 + 6 + 8 + 9 + 7 + 8 + 9 + 9).

It is not an unprimeable number, because it can be changed into a prime (166897897) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1324524 + ... + 1324649.

It is an arithmetic number, because the mean of its divisors is an integer number (22959508).

Almost surely, 2^166897899 is an apocalyptic number.

166897899 is a deficient number, since it is larger than the sum of its proper divisors (108616197).

166897899 is a wasteful number, since it uses less digits than its factorization.

166897899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2649186 (or 2649183 counting only the distinct ones).

The product of its digits is 11757312, while the sum is 63.

The square root of 166897899 is about 12918.8969730391. The cubic root of 166897899 is about 550.5755946547.

The spelling of 166897899 in words is "one hundred sixty-six million, eight hundred ninety-seven thousand, eight hundred ninety-nine".