16660400737 has 8 divisors (see below), whose sum is σ = 17141983616. Its totient is φ = 16180465392.

The previous prime is 16660400719. The next prime is 16660400749. The reversal of 16660400737 is 73700406661.

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-16660400737 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16660400737.

It is not an unprimeable number, because it can be changed into a prime (16660400777) 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, 391353 + ... + 431830.

It is an arithmetic number, because the mean of its divisors is an integer number (2142747952).

Almost surely, 2^16660400737 is an apocalyptic number.

It is an amenable number.

16660400737 is a deficient number, since it is larger than the sum of its proper divisors (481582879).

16660400737 is an equidigital number, since it uses as much as digits as its factorization.

16660400737 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 823767.

The product of its (nonzero) digits is 127008, while the sum is 40.

The spelling of 16660400737 in words is "sixteen billion, six hundred sixty million, four hundred thousand, seven hundred thirty-seven".