16051613281 has 6 divisors (see below), whose sum is σ = 17643508946. Its totient is φ = 14592375600.

The previous prime is 16051613213. The next prime is 16051613293. The reversal of 16051613281 is 18231615061.

It can be written as a sum of positive squares in only one way, i.e., 11919180625 + 4132432656 = 109175^2 + 64284^2 .

It is not a de Polignac number, because 16051613281 - 2⁷ = 16051613153 is a prime.

It is a super-2 number, since 2×16051613281² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16051613381) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 66328860 + ... + 66329101.

Almost surely, 2^16051613281 is an apocalyptic number.

16051613281 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16051613281 is a deficient number, since it is larger than the sum of its proper divisors (1591895665).

16051613281 is a wasteful number, since it uses less digits than its factorization.

16051613281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132657983 (or 132657972 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 34.

The spelling of 16051613281 in words is "sixteen billion, fifty-one million, six hundred thirteen thousand, two hundred eighty-one".