16662026661 has 64 divisors (see below), whose sum is σ = 26615857152. Its totient is φ = 9072000000.

The previous prime is 16662026659. The next prime is 16662026663.

It is a happy number.

16662026661 is nontrivially palindromic in base 10.

It is an interprime number because it is at equal distance from previous prime (16662026659) and next prime (16662026663).

It is not a de Polignac number, because 16662026661 - 2¹ = 16662026659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16662026663) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 13872861 + ... + 13874061.

It is an arithmetic number, because the mean of its divisors is an integer number (415872768).

Almost surely, 2^16662026661 is an apocalyptic number.

It is an amenable number.

16662026661 is a deficient number, since it is larger than the sum of its proper divisors (9953830491).

16662026661 is a wasteful number, since it uses less digits than its factorization.

16662026661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1554.

The product of its (nonzero) digits is 186624, while the sum is 42.

The spelling of 16662026661 in words is "sixteen billion, six hundred sixty-two million, twenty-six thousand, six hundred sixty-one".