2018513187561 has 32 divisors (see below), whose sum is σ = 3001620041728. Its totient is φ = 1198176390720.

The previous prime is 2018513187547. The next prime is 2018513187571. The reversal of 2018513187561 is 1657813158102.

It is a happy number.

It is not a de Polignac number, because 2018513187561 - 2⁵ = 2018513187529 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2018513187561.

It is not an unprimeable number, because it can be changed into a prime (2018513187511) 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, 2348011 + ... + 3090336.

It is an arithmetic number, because the mean of its divisors is an integer number (93800626304).

Almost surely, 2^{2018513187561} is an apocalyptic number.

It is an amenable number.

2018513187561 is a deficient number, since it is larger than the sum of its proper divisors (983106854167).

2018513187561 is a wasteful number, since it uses less digits than its factorization.

2018513187561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5438701.

The product of its (nonzero) digits is 403200, while the sum is 48.

The spelling of 2018513187561 in words is "two trillion, eighteen billion, five hundred thirteen million, one hundred eighty-seven thousand, five hundred sixty-one".