118397661 has 4 divisors (see below), whose sum is σ = 157863552. Its totient is φ = 78931772.

The previous prime is 118397651. The next prime is 118397677. The reversal of 118397661 is 166793811.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 118397661 - 2¹⁰ = 118396637 is a prime.

It is a super-2 number, since 2×118397661² = 28036012260541842, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (118397611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19732941 + ... + 19732946.

It is an arithmetic number, because the mean of its divisors is an integer number (39465888).

Almost surely, 2^118397661 is an apocalyptic number.

It is an amenable number.

118397661 is a deficient number, since it is larger than the sum of its proper divisors (39465891).

118397661 is an equidigital number, since it uses as much as digits as its factorization.

118397661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39465890.

The product of its digits is 54432, while the sum is 42.

The square root of 118397661 is about 10881.0689272700. The cubic root of 118397661 is about 491.0371769434.

The spelling of 118397661 in words is "one hundred eighteen million, three hundred ninety-seven thousand, six hundred sixty-one".