16521401452 has 6 divisors (see below), whose sum is σ = 28912452548. Its totient is φ = 8260700724.

The previous prime is 16521401437. The next prime is 16521401483. The reversal of 16521401452 is 25410412561.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2065175178 + ... + 2065175185.

Almost surely, 2^16521401452 is an apocalyptic number.

It is an amenable number.

16521401452 is a deficient number, since it is larger than the sum of its proper divisors (12391051096).

16521401452 is a wasteful number, since it uses less digits than its factorization.

16521401452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4130350367 (or 4130350365 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 31.

The spelling of 16521401452 in words is "sixteen billion, five hundred twenty-one million, four hundred one thousand, four hundred fifty-two".