16400657789 has 8 divisors (see below), whose sum is σ = 16495959480. Its totient is φ = 16305408000.

The previous prime is 16400657753. The next prime is 16400657803. The reversal of 16400657789 is 98775600461.

It can be written as a sum of positive squares in 4 ways, for example, as 4199688025 + 12200969764 = 64805^2 + 110458^2 .

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 16400657789 - 2²⁴ = 16383880573 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 16400657789.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16400657989) 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, 749597 + ... + 771165.

It is an arithmetic number, because the mean of its divisors is an integer number (2061994935).

Almost surely, 2^16400657789 is an apocalyptic number.

It is an amenable number.

16400657789 is a deficient number, since it is larger than the sum of its proper divisors (95301691).

16400657789 is a wasteful number, since it uses less digits than its factorization.

16400657789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25951.

The product of its (nonzero) digits is 2540160, while the sum is 53.

The spelling of 16400657789 in words is "sixteen billion, four hundred million, six hundred fifty-seven thousand, seven hundred eighty-nine".