118167661 has 2 divisors, whose sum is σ = 118167662. Its totient is φ = 118167660.

The previous prime is 118167659. The next prime is 118167667. The reversal of 118167661 is 166761811.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 83722500 + 34445161 = 9150^2 + 5869^2 .

It is a cyclic number.

It is not a de Polignac number, because 118167661 - 2¹ = 118167659 is a prime.

It is a super-2 number, since 2×118167661² = 27927192212421842, which contains 22 as substring.

Together with 118167659, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 118167661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (118167667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 59083830 + 59083831.

It is an arithmetic number, because the mean of its divisors is an integer number (59083831).

Almost surely, 2^118167661 is an apocalyptic number.

It is an amenable number.

118167661 is a deficient number, since it is larger than the sum of its proper divisors (1).

118167661 is an equidigital number, since it uses as much as digits as its factorization.

118167661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 37.

The square root of 118167661 is about 10870.4949749310. The cubic root of 118167661 is about 490.7190069152.

It can be divided in two parts, 118167 and 661, that added together give a triangular number (118828 = T₄₈₇).

The spelling of 118167661 in words is "one hundred eighteen million, one hundred sixty-seven thousand, six hundred sixty-one".