16726400752661 has 8 divisors (see below), whose sum is σ = 17606775415200. Its totient is φ = 15846029868240.

The previous prime is 16726400752639. The next prime is 16726400752667. The reversal of 16726400752661 is 16625700462761.

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 not a de Polignac number, because 16726400752661 - 2⁶ = 16726400752597 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 (16726400752667) 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, 15357071 + ... + 16410131.

It is an arithmetic number, because the mean of its divisors is an integer number (2200846926900).

Almost surely, 2^{16726400752661} is an apocalyptic number.

It is an amenable number.

16726400752661 is a deficient number, since it is larger than the sum of its proper divisors (880374662539).

16726400752661 is a wasteful number, since it uses less digits than its factorization.

16726400752661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1889059.

The product of its (nonzero) digits is 5080320, while the sum is 53.

The spelling of 16726400752661 in words is "sixteen trillion, seven hundred twenty-six billion, four hundred million, seven hundred fifty-two thousand, six hundred sixty-one".