16506145257 has 32 divisors (see below), whose sum is σ = 26698408704. Its totient is φ = 8855040000.

The previous prime is 16506145237. The next prime is 16506145277. The reversal of 16506145257 is 75254160561.

It is an interprime number because it is at equal distance from previous prime (16506145237) and next prime (16506145277).

It is not a de Polignac number, because 16506145257 - 2⁷ = 16506145129 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16506145237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 85507 + ... + 200807.

It is an arithmetic number, because the mean of its divisors is an integer number (834325272).

Almost surely, 2^16506145257 is an apocalyptic number.

16506145257 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

16506145257 is a deficient number, since it is larger than the sum of its proper divisors (10192263447).

16506145257 is a wasteful number, since it uses less digits than its factorization.

16506145257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115729.

The product of its (nonzero) digits is 252000, while the sum is 42.

The spelling of 16506145257 in words is "sixteen billion, five hundred six million, one hundred forty-five thousand, two hundred fifty-seven".