13146563661 has 32 divisors (see below), whose sum is σ = 21883416576. Its totient is φ = 6820200000.

The previous prime is 13146563597. The next prime is 13146563701. The reversal of 13146563661 is 16636564131.

It is not a de Polignac number, because 13146563661 - 2⁶ = 13146563597 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13146563761) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 135591 + ... + 211371.

It is an arithmetic number, because the mean of its divisors is an integer number (683856768).

Almost surely, 2^13146563661 is an apocalyptic number.

13146563661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

13146563661 is a deficient number, since it is larger than the sum of its proper divisors (8736852915).

13146563661 is a wasteful number, since it uses less digits than its factorization.

13146563661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76553.

The product of its digits is 233280, while the sum is 42.

The spelling of 13146563661 in words is "thirteen billion, one hundred forty-six million, five hundred sixty-three thousand, six hundred sixty-one".