16215128640 has 224 divisors, whose sum is σ = 58750565760. Its totient is φ = 4207085568.

The previous prime is 16215128621. The next prime is 16215128659. The reversal of 16215128640 is 4682151261.

It is a happy number.

16215128640 is a `hidden beast` number, since 1 + 6 + 2 + 1 + 5 + 1 + 2 + 8 + 640 = 666.

It is an interprime number because it is at equal distance from previous prime (16215128621) and next prime (16215128659).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 16215128595 and 16215128604.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 294319 + ... + 345041.

Almost surely, 2^16215128640 is an apocalyptic number.

16215128640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16215128640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29375282880).

16215128640 is an abundant number, since it is smaller than the sum of its proper divisors (42535437120).

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

16215128640 is a wasteful number, since it uses less digits than its factorization.

16215128640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50786 (or 50770 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The spelling of 16215128640 in words is "sixteen billion, two hundred fifteen million, one hundred twenty-eight thousand, six hundred forty".