14918155661 has 4 divisors (see below), whose sum is σ = 14919916572. Its totient is φ = 14916394752.

The previous prime is 14918155621. The next prime is 14918155663. The reversal of 14918155661 is 16655181941.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7626703561 + 7291452100 = 87331^2 + 85390^2 .

It is a cyclic number.

It is not a de Polignac number, because 14918155661 - 2²² = 14913961357 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 (14918155663) 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, 867686 + ... + 884711.

It is an arithmetic number, because the mean of its divisors is an integer number (3729979143).

Almost surely, 2^14918155661 is an apocalyptic number.

It is an amenable number.

14918155661 is a deficient number, since it is larger than the sum of its proper divisors (1760911).

14918155661 is an equidigital number, since it uses as much as digits as its factorization.

14918155661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1760910.

The product of its digits is 259200, while the sum is 47.

The spelling of 14918155661 in words is "fourteen billion, nine hundred eighteen million, one hundred fifty-five thousand, six hundred sixty-one".