15640520450 has 12 divisors (see below), whose sum is σ = 29091368130. Its totient is φ = 6256208160.

The previous prime is 15640520429. The next prime is 15640520459. The reversal of 15640520450 is 5402504651.

15640520450 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 9027090121 + 6613430329 = 95011^2 + 81323^2 .

It is not an unprimeable number, because it can be changed into a prime (15640520459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 156405155 + ... + 156405254.

Almost surely, 2^15640520450 is an apocalyptic number.

15640520450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

15640520450 is a deficient number, since it is larger than the sum of its proper divisors (13450847680).

15640520450 is a wasteful number, since it uses less digits than its factorization.

15640520450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312810421 (or 312810416 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 32.

The spelling of 15640520450 in words is "fifteen billion, six hundred forty million, five hundred twenty thousand, four hundred fifty".