3561540671618 has 8 divisors (see below), whose sum is σ = 5343258074700. Its totient is φ = 1780454646720.

The previous prime is 3561540671617. The next prime is 3561540671639. The reversal of 3561540671618 is 8161760451653.

It can be written as a sum of positive squares in 2 ways, for example, as 3561535163209 + 5508409 = 1887203^2 + 2347^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 3561540671618.

It is not an unprimeable number, because it can be changed into a prime (3561540671617) 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, 157830443 + ... + 157853006.

Almost surely, 2^{3561540671618} is an apocalyptic number.

3561540671618 is a deficient number, since it is larger than the sum of its proper divisors (1781717403082).

3561540671618 is a wasteful number, since it uses less digits than its factorization.

3561540671618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315689092.

The product of its (nonzero) digits is 3628800, while the sum is 53.

The spelling of 3561540671618 in words is "three trillion, five hundred sixty-one billion, five hundred forty million, six hundred seventy-one thousand, six hundred eighteen".