18088561780661 has 8 divisors (see below), whose sum is σ = 18238966808448. Its totient is φ = 17938766916000.

The previous prime is 18088561780649. The next prime is 18088561780669. The reversal of 18088561780661 is 16608716588081.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18088561780661 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 (18088561780669) 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, 152481245 + ... + 152599826.

It is an arithmetic number, because the mean of its divisors is an integer number (2279870851056).

Almost surely, 2^{18088561780661} is an apocalyptic number.

It is an amenable number.

18088561780661 is a deficient number, since it is larger than the sum of its proper divisors (150405027787).

18088561780661 is a wasteful number, since it uses less digits than its factorization.

18088561780661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305081563.

The product of its (nonzero) digits is 30965760, while the sum is 65.

The spelling of 18088561780661 in words is "eighteen trillion, eighty-eight billion, five hundred sixty-one million, seven hundred eighty thousand, six hundred sixty-one".