16215617025 has 144 divisors (see below), whose sum is σ = 31504412160. Its totient is φ = 7943270400.

The previous prime is 16215617023. The next prime is 16215617029. The reversal of 16215617025 is 52071651261.

16215617025 is a `hidden beast` number, since 1 + 6 + 2 + 1 + 561 + 70 + 25 = 666.

It is not a de Polignac number, because 16215617025 - 2¹ = 16215617023 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16215617023) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 31123765 + ... + 31124285.

It is an arithmetic number, because the mean of its divisors is an integer number (218780640).

Almost surely, 2^16215617025 is an apocalyptic number.

16215617025 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16215617025 is a deficient number, since it is larger than the sum of its proper divisors (15288795135).

16215617025 is a wasteful number, since it uses less digits than its factorization.

16215617025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 736 (or 728 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 36.

The spelling of 16215617025 in words is "sixteen billion, two hundred fifteen million, six hundred seventeen thousand, twenty-five".