16374017521 has 9 divisors (see below), whose sum is σ = 16788503649. Its totient is φ = 15969532800.

The previous prime is 16374017519. The next prime is 16374017549. The reversal of 16374017521 is 12571047361.

The square root of 16374017521 is 127961.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 15398079921 + 975937600 = 124089^2 + 31240^2 .

It is not a de Polignac number, because 16374017521 - 2¹ = 16374017519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16374015521) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 5244841 + ... + 5247961.

Almost surely, 2^16374017521 is an apocalyptic number.

16374017521 is the 127961-st square number.

16374017521 is the 63981-st centered octagonal number.

It is an amenable number.

16374017521 is a deficient number, since it is larger than the sum of its proper divisors (414486128).

16374017521 is an frugal number, since it uses more digits than its factorization.

16374017521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6324 (or 3162 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 37.

The spelling of 16374017521 in words is "sixteen billion, three hundred seventy-four million, seventeen thousand, five hundred twenty-one".