13491212661 has 40 divisors (see below), whose sum is σ = 20559797280. Its totient is φ = 8814228192.

The previous prime is 13491212659. The next prime is 13491212677. The reversal of 13491212661 is 16621219431.

It is a happy number.

It is not a de Polignac number, because 13491212661 - 2¹ = 13491212659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13491202661) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1062810 + ... + 1075428.

It is an arithmetic number, because the mean of its divisors is an integer number (513994932).

Almost surely, 2^13491212661 is an apocalyptic number.

It is an amenable number.

13491212661 is a deficient number, since it is larger than the sum of its proper divisors (7068584619).

13491212661 is a wasteful number, since it uses less digits than its factorization.

13491212661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12895 (or 12886 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The spelling of 13491212661 in words is "thirteen billion, four hundred ninety-one million, two hundred twelve thousand, six hundred sixty-one".