166761213 has 8 divisors (see below), whose sum is σ = 222945888. Its totient is φ = 110875344.

The previous prime is 166761187. The next prime is 166761239. The reversal of 166761213 is 312167661.

It is an interprime number because it is at equal distance from previous prime (166761187) and next prime (166761239).

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

It is not a de Polignac number, because 166761213 - 2¹² = 166757117 is a prime.

It is a super-2 number, since 2×166761213² = 55618604322462738, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166761253) 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, 73395 + ... + 75632.

It is an arithmetic number, because the mean of its divisors is an integer number (27868236).

Almost surely, 2^166761213 is an apocalyptic number.

It is an amenable number.

166761213 is a deficient number, since it is larger than the sum of its proper divisors (56184675).

166761213 is a wasteful number, since it uses less digits than its factorization.

166761213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149403.

The product of its digits is 9072, while the sum is 33.

The square root of 166761213 is about 12913.6057319402. The cubic root of 166761213 is about 550.4252501828.

The spelling of 166761213 in words is "one hundred sixty-six million, seven hundred sixty-one thousand, two hundred thirteen".