16446687725 has 48 divisors (see below), whose sum is σ = 22562253840. Its totient is φ = 11815372800.

The previous prime is 16446687683. The next prime is 16446687731. The reversal of 16446687725 is 52778664461.

It can be written as a sum of positive squares in 24 ways, for example, as 16347923881 + 98763844 = 127859^2 + 9938^2 .

It is not a de Polignac number, because 16446687725 - 2¹⁰ = 16446686701 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5288471 + ... + 5291579.

It is an arithmetic number, because the mean of its divisors is an integer number (470046955).

Almost surely, 2^16446687725 is an apocalyptic number.

It is an amenable number.

16446687725 is a deficient number, since it is larger than the sum of its proper divisors (6115566115).

16446687725 is a wasteful number, since it uses less digits than its factorization.

16446687725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3570 (or 3565 counting only the distinct ones).

The product of its digits is 13547520, while the sum is 56.

The spelling of 16446687725 in words is "sixteen billion, four hundred forty-six million, six hundred eighty-seven thousand, seven hundred twenty-five".