16256138401 has 4 divisors (see below), whose sum is σ = 16272061204. Its totient is φ = 16240215600.

The previous prime is 16256138399. The next prime is 16256138417. The reversal of 16256138401 is 10483165261.

It is a happy number.

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 14220324001 + 2035814400 = 119249^2 + 45120^2 .

It is a cyclic number.

It is not a de Polignac number, because 16256138401 - 2¹ = 16256138399 is a prime.

It is a super-4 number, since 4×16256138401⁴ (a number of 42 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16256133401) 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, 7959870 + ... + 7961911.

It is an arithmetic number, because the mean of its divisors is an integer number (4068015301).

Almost surely, 2^16256138401 is an apocalyptic number.

It is an amenable number.

16256138401 is a deficient number, since it is larger than the sum of its proper divisors (15922803).

16256138401 is a wasteful number, since it uses less digits than its factorization.

16256138401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15922802.

The product of its (nonzero) digits is 34560, while the sum is 37.

The spelling of 16256138401 in words is "sixteen billion, two hundred fifty-six million, one hundred thirty-eight thousand, four hundred one".