16251003081 has 32 divisors (see below), whose sum is σ = 24617349120. Its totient is φ = 10590752592.

The previous prime is 16251003079. The next prime is 16251003127. The reversal of 16251003081 is 18030015261.

16251003081 is a `hidden beast` number, since 1 + 625 + 1 + 0 + 0 + 30 + 8 + 1 = 666.

It is not a de Polignac number, because 16251003081 - 2¹ = 16251003079 is a prime.

It is a super-2 number, since 2×16251003081² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (16251003061) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1113276 + ... + 1127778.

It is an arithmetic number, because the mean of its divisors is an integer number (769292160).

Almost surely, 2^16251003081 is an apocalyptic number.

It is an amenable number.

16251003081 is a deficient number, since it is larger than the sum of its proper divisors (8366346039).

16251003081 is a wasteful number, since it uses less digits than its factorization.

16251003081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15442 (or 15436 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The spelling of 16251003081 in words is "sixteen billion, two hundred fifty-one million, three thousand, eighty-one".