13661263649 has 8 divisors (see below), whose sum is σ = 14931698592. Its totient is φ = 12395579040.

The previous prime is 13661263621. The next prime is 13661263669. The reversal of 13661263649 is 94636216631.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13661263649 - 2¹² = 13661259553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13661263669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1181564 + ... + 1193069.

It is an arithmetic number, because the mean of its divisors is an integer number (1866462324).

Almost surely, 2^13661263649 is an apocalyptic number.

It is an amenable number.

13661263649 is a deficient number, since it is larger than the sum of its proper divisors (1270434943).

13661263649 is a wasteful number, since it uses less digits than its factorization.

13661263649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2375167.

The product of its digits is 839808, while the sum is 47.

The spelling of 13661263649 in words is "thirteen billion, six hundred sixty-one million, two hundred sixty-three thousand, six hundred forty-nine".