13649948857 has 4 divisors (see below), whose sum is σ = 13659229696. Its totient is φ = 13640668020.

The previous prime is 13649948843. The next prime is 13649948881. The reversal of 13649948857 is 75884994631.

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 13649948857 - 2¹⁵ = 13649916089 is a prime.

It is a super-2 number, since 2×13649948857² (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 (13649948827) 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, 4638213 + ... + 4641154.

It is an arithmetic number, because the mean of its divisors is an integer number (3414807424).

Almost surely, 2^13649948857 is an apocalyptic number.

It is an amenable number.

13649948857 is a deficient number, since it is larger than the sum of its proper divisors (9280839).

13649948857 is an equidigital number, since it uses as much as digits as its factorization.

13649948857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9280838.

The product of its digits is 52254720, while the sum is 64.

The spelling of 13649948857 in words is "thirteen billion, six hundred forty-nine million, nine hundred forty-eight thousand, eight hundred fifty-seven".