17642311661 has 8 divisors (see below), whose sum is σ = 19999381920. Its totient is φ = 15428094192.

The previous prime is 17642311633. The next prime is 17642311693. The reversal of 17642311661 is 16611324671.

It is a happy number.

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-17642311661 is a prime.

It is a super-2 number, since 2×17642311661² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (17642311861) 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, 35712935 + ... + 35713428.

It is an arithmetic number, because the mean of its divisors is an integer number (2499922740).

Almost surely, 2^17642311661 is an apocalyptic number.

It is an amenable number.

17642311661 is a deficient number, since it is larger than the sum of its proper divisors (2357070259).

17642311661 is a wasteful number, since it uses less digits than its factorization.

17642311661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71426395.

The product of its digits is 36288, while the sum is 38.

The spelling of 17642311661 in words is "seventeen billion, six hundred forty-two million, three hundred eleven thousand, six hundred sixty-one".