115653661 has 4 divisors (see below), whose sum is σ = 118474524. Its totient is φ = 112832800.

The previous prime is 115653649. The next prime is 115653673. The reversal of 115653661 is 166356511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 166356511 = 67 ⋅2482933.

It is an interprime number because it is at equal distance from previous prime (115653649) and next prime (115653673).

It can be written as a sum of positive squares in 2 ways, for example, as 50851161 + 64802500 = 7131^2 + 8050^2 .

It is a cyclic number.

It is not a de Polignac number, because 115653661 - 2¹⁹ = 115129373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115653691) 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, 1410370 + ... + 1410451.

It is an arithmetic number, because the mean of its divisors is an integer number (29618631).

Almost surely, 2^115653661 is an apocalyptic number.

It is an amenable number.

115653661 is a deficient number, since it is larger than the sum of its proper divisors (2820863).

115653661 is an equidigital number, since it uses as much as digits as its factorization.

115653661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2820862.

The product of its digits is 16200, while the sum is 34.

The square root of 115653661 is about 10754.2392106555. The cubic root of 115653661 is about 487.2140401389.

The spelling of 115653661 in words is "one hundred fifteen million, six hundred fifty-three thousand, six hundred sixty-one".