16215563256 has 32 divisors (see below), whose sum is σ = 41027333760. Its totient is φ = 5340064352.

The previous prime is 16215563251. The next prime is 16215563291. The reversal of 16215563256 is 65236551261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16215563251) 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, 4068180 + ... + 4072163.

It is an arithmetic number, because the mean of its divisors is an integer number (1282104180).

Almost surely, 2^16215563256 is an apocalyptic number.

It is an amenable number.

16215563256 is an abundant number, since it is smaller than the sum of its proper divisors (24811770504).

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

16215563256 is a wasteful number, since it uses less digits than its factorization.

16215563256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8140435 (or 8140431 counting only the distinct ones).

The product of its digits is 324000, while the sum is 42.

The spelling of 16215563256 in words is "sixteen billion, two hundred fifteen million, five hundred sixty-three thousand, two hundred fifty-six".