15645010000 has 50 divisors (see below), whose sum is σ = 37878157922. Its totient is φ = 6258000000.

The previous prime is 15645009997. The next prime is 15645010061. The reversal of 15645010000 is 1054651.

It can be written as a sum of positive squares in 5 ways, for example, as 10005600784 + 5639409216 = 100028^2 + 75096^2 .

It is a tau number, because it is divible by the number of its divisors (50).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 772251 + ... + 792250.

Almost surely, 2^15645010000 is an apocalyptic number.

15645010000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15645010000 is an abundant number, since it is smaller than the sum of its proper divisors (22233147922).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

15645010000 is an equidigital number, since it uses as much as digits as its factorization.

15645010000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1564529 (or 1564508 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 22.

Adding to 15645010000 its reverse (1054651), we get a palindrome (15646064651).

The spelling of 15645010000 in words is "fifteen billion, six hundred forty-five million, ten thousand".