13005649861 has 8 divisors (see below), whose sum is σ = 13109103104. Its totient is φ = 12902591520.

The previous prime is 13005649763. The next prime is 13005649871. The reversal of 13005649861 is 16894650031.

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 13005649861 - 2⁷ = 13005649733 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13005649871) 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, 32421 + ... + 164506.

It is an arithmetic number, because the mean of its divisors is an integer number (1638637888).

Almost surely, 2^13005649861 is an apocalyptic number.

It is an amenable number.

13005649861 is a deficient number, since it is larger than the sum of its proper divisors (103453243).

13005649861 is a wasteful number, since it uses less digits than its factorization.

13005649861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197451.

The product of its (nonzero) digits is 155520, while the sum is 43.

The spelling of 13005649861 in words is "thirteen billion, five million, six hundred forty-nine thousand, eight hundred sixty-one".