166267665 has 24 divisors (see below), whose sum is σ = 288518568. Its totient is φ = 88577280.

The previous prime is 166267657. The next prime is 166267687. The reversal of 166267665 is 566762661.

166267665 is a `hidden beast` number, since 16 + 626 + 7 + 6 + 6 + 5 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 69205761 + 97061904 = 8319^2 + 9852^2 .

It is not a de Polignac number, because 166267665 - 2³ = 166267657 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 166267665.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 58047 + ... + 60843.

It is an arithmetic number, because the mean of its divisors is an integer number (12021607).

Almost surely, 2^166267665 is an apocalyptic number.

166267665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

166267665 is a deficient number, since it is larger than the sum of its proper divisors (122250903).

166267665 is a wasteful number, since it uses less digits than its factorization.

166267665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4129 (or 4126 counting only the distinct ones).

The product of its digits is 544320, while the sum is 45.

The square root of 166267665 is about 12894.4819593499. The cubic root of 166267665 is about 549.8816990741.

The spelling of 166267665 in words is "one hundred sixty-six million, two hundred sixty-seven thousand, six hundred sixty-five".