13659400409 has 4 divisors (see below), whose sum is σ = 14378316240. Its totient is φ = 12940484580.

The previous prime is 13659400373. The next prime is 13659400429. The reversal of 13659400409 is 90400495631.

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 a de Polignac number, because none of the positive numbers 2^k-13659400409 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13659400429) 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, 359457887 + ... + 359457924.

It is an arithmetic number, because the mean of its divisors is an integer number (3594579060).

Almost surely, 2^13659400409 is an apocalyptic number.

13659400409 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

13659400409 is a deficient number, since it is larger than the sum of its proper divisors (718915831).

13659400409 is an equidigital number, since it uses as much as digits as its factorization.

13659400409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 718915830.

The product of its (nonzero) digits is 116640, while the sum is 41.

The spelling of 13659400409 in words is "thirteen billion, six hundred fifty-nine million, four hundred thousand, four hundred nine".