13997985257 has 4 divisors (see below), whose sum is σ = 14081805696. Its totient is φ = 13914164820.

The previous prime is 13997985229. The next prime is 13997985277. The reversal of 13997985257 is 75258979931.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 13997985257 - 2¹⁶ = 13997919721 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13997985193 and 13997985202.

It is not an unprimeable number, because it can be changed into a prime (13997985227) 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, 41909969 + ... + 41910302.

It is an arithmetic number, because the mean of its divisors is an integer number (3520451424).

Almost surely, 2^13997985257 is an apocalyptic number.

It is an amenable number.

13997985257 is a deficient number, since it is larger than the sum of its proper divisors (83820439).

13997985257 is an equidigital number, since it uses as much as digits as its factorization.

13997985257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83820438.

The product of its digits is 42865200, while the sum is 65.

The spelling of 13997985257 in words is "thirteen billion, nine hundred ninety-seven million, nine hundred eighty-five thousand, two hundred fifty-seven".