13611061566 has 12 divisors (see below), whose sum is σ = 29490633432. Its totient is φ = 4537020516.

The previous prime is 13611061561. The next prime is 13611061619. The reversal of 13611061566 is 66516011631.

13611061566 is a `hidden beast` number, since 1 + 36 + 1 + 1 + 0 + 61 + 566 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 13611061566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13611061561) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 378085026 + ... + 378085061.

It is an arithmetic number, because the mean of its divisors is an integer number (2457552786).

Almost surely, 2^13611061566 is an apocalyptic number.

13611061566 is an abundant number, since it is smaller than the sum of its proper divisors (15879571866).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13611061566 is a wasteful number, since it uses less digits than its factorization.

13611061566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 756170095 (or 756170092 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The spelling of 13611061566 in words is "thirteen billion, six hundred eleven million, sixty-one thousand, five hundred sixty-six".