13571283661 has 4 divisors (see below), whose sum is σ = 14615228572. Its totient is φ = 12527338752.

The previous prime is 13571283659. The next prime is 13571283703. The reversal of 13571283661 is 16638217531.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6315480900 + 7255802761 = 79470^2 + 85181^2 .

It is a cyclic number.

It is not a de Polignac number, because 13571283661 - 2¹ = 13571283659 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 (13571283161) 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, 521972436 + ... + 521972461.

It is an arithmetic number, because the mean of its divisors is an integer number (3653807143).

Almost surely, 2^13571283661 is an apocalyptic number.

It is an amenable number.

13571283661 is a deficient number, since it is larger than the sum of its proper divisors (1043944911).

13571283661 is a wasteful number, since it uses less digits than its factorization.

13571283661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1043944910.

The product of its digits is 181440, while the sum is 43.

The spelling of 13571283661 in words is "thirteen billion, five hundred seventy-one million, two hundred eighty-three thousand, six hundred sixty-one".