16257401081 has 4 divisors (see below), whose sum is σ = 16425003252. Its totient is φ = 16089798912.

The previous prime is 16257401077. The next prime is 16257401119. The reversal of 16257401081 is 18010475261.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6165390400 + 10092010681 = 78520^2 + 100459^2 .

It is a cyclic number.

It is not a de Polignac number, because 16257401081 - 2² = 16257401077 is a prime.

It is a super-2 number, since 2×16257401081² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a zygodrome in base 3.

It is not an unprimeable number, because it can be changed into a prime (16257401011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83800940 + ... + 83801133.

It is an arithmetic number, because the mean of its divisors is an integer number (4106250813).

Almost surely, 2^16257401081 is an apocalyptic number.

It is an amenable number.

16257401081 is a deficient number, since it is larger than the sum of its proper divisors (167602171).

16257401081 is an equidigital number, since it uses as much as digits as its factorization.

16257401081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167602170.

The product of its (nonzero) digits is 13440, while the sum is 35.

The spelling of 16257401081 in words is "sixteen billion, two hundred fifty-seven million, four hundred one thousand, eighty-one".