918865661 has 8 divisors (see below), whose sum is σ = 1052413824. Its totient is φ = 785887920.

The previous prime is 918865643. The next prime is 918865681. The reversal of 918865661 is 166568819.

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

It is a cyclic number.

It is not a de Polignac number, because 918865661 - 2¹⁴ = 918849277 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (918865601) 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, 139145 + ... + 145598.

It is an arithmetic number, because the mean of its divisors is an integer number (131551728).

Almost surely, 2^918865661 is an apocalyptic number.

It is an amenable number.

918865661 is a deficient number, since it is larger than the sum of its proper divisors (133548163).

918865661 is a wasteful number, since it uses less digits than its factorization.

918865661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285211.

The product of its digits is 622080, while the sum is 50.

The square root of 918865661 is about 30312.7969841122. The cubic root of 918865661 is about 972.1889352142.

The spelling of 918865661 in words is "nine hundred eighteen million, eight hundred sixty-five thousand, six hundred sixty-one".