16404756649691 has 16 divisors (see below), whose sum is σ = 17581442001984. Its totient is φ = 15266728819584.

The previous prime is 16404756649657. The next prime is 16404756649693. The reversal of 16404756649691 is 19694665740461.

It is a cyclic number.

It is not a de Polignac number, because 16404756649691 - 2¹⁰ = 16404756648667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16404756649693) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19130465 + ... + 19969581.

It is an arithmetic number, because the mean of its divisors is an integer number (1098840125124).

Almost surely, 2^{16404756649691} is an apocalyptic number.

16404756649691 is a deficient number, since it is larger than the sum of its proper divisors (1176685352293).

16404756649691 is a wasteful number, since it uses less digits than its factorization.

16404756649691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 862150.

The product of its (nonzero) digits is 235146240, while the sum is 68.

The spelling of 16404756649691 in words is "sixteen trillion, four hundred four billion, seven hundred fifty-six million, six hundred forty-nine thousand, six hundred ninety-one".