166049261 has 16 divisors (see below), whose sum is σ = 195256320. Its totient is φ = 138259440.

The previous prime is 166049243. The next prime is 166049263. The reversal of 166049261 is 162940661.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166049261 is a prime.

It is a super-2 number, since 2×166049261² = 55144714157292242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166049263) 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, 43916 + ... + 47546.

It is an arithmetic number, because the mean of its divisors is an integer number (12203520).

Almost surely, 2^166049261 is an apocalyptic number.

It is an amenable number.

166049261 is a deficient number, since it is larger than the sum of its proper divisors (29207059).

166049261 is a wasteful number, since it uses less digits than its factorization.

166049261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3824.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 166049261 is about 12886.0102824730. The cubic root of 166049261 is about 549.6408244459.

The spelling of 166049261 in words is "one hundred sixty-six million, forty-nine thousand, two hundred sixty-one".