18661095 has 12 divisors (see below), whose sum is σ = 32345976. Its totient is φ = 9952560.

The previous prime is 18661091. The next prime is 18661099. The reversal of 18661095 is 59016681.

It is an interprime number because it is at equal distance from previous prime (18661091) and next prime (18661099).

It is not a de Polignac number, because 18661095 - 2² = 18661091 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18661091) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 207301 + ... + 207390.

It is an arithmetic number, because the mean of its divisors is an integer number (2695498).

Almost surely, 2^18661095 is an apocalyptic number.

18661095 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

18661095 is a deficient number, since it is larger than the sum of its proper divisors (13684881).

18661095 is a wasteful number, since it uses less digits than its factorization.

18661095 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 414702 (or 414699 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 18661095 is about 4319.8489556928. The cubic root of 18661095 is about 265.2440850662.

The spelling of 18661095 in words is "eighteen million, six hundred sixty-one thousand, ninety-five".