16251521252 has 6 divisors (see below), whose sum is σ = 28440162198. Its totient is φ = 8125760624.

The previous prime is 16251521239. The next prime is 16251521257. The reversal of 16251521252 is 25212515261.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 8342264896 + 7909256356 = 91336^2 + 88934^2 .

It is a super-2 number, since 2×16251521252² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16251521257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2031440153 + ... + 2031440160.

It is an arithmetic number, because the mean of its divisors is an integer number (4740027033).

Almost surely, 2^16251521252 is an apocalyptic number.

It is an amenable number.

16251521252 is a deficient number, since it is larger than the sum of its proper divisors (12188640946).

16251521252 is a wasteful number, since it uses less digits than its factorization.

16251521252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4062880317 (or 4062880315 counting only the distinct ones).

The product of its digits is 12000, while the sum is 32.

The spelling of 16251521252 in words is "sixteen billion, two hundred fifty-one million, five hundred twenty-one thousand, two hundred fifty-two".