15648836440 has 32 divisors (see below), whose sum is σ = 35215372080. Its totient is φ = 6258558592.

The previous prime is 15648836407. The next prime is 15648836443. The reversal of 15648836440 is 4463884651.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15648836443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 264462 + ... + 318178.

Almost surely, 2^15648836440 is an apocalyptic number.

15648836440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15648836440 is an abundant number, since it is smaller than the sum of its proper divisors (19566535640).

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

15648836440 is a wasteful number, since it uses less digits than its factorization.

15648836440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61011 (or 61007 counting only the distinct ones).

The product of its (nonzero) digits is 2211840, while the sum is 49.

The spelling of 15648836440 in words is "fifteen billion, six hundred forty-eight million, eight hundred thirty-six thousand, four hundred forty".