2661541133365 has 16 divisors (see below), whose sum is σ = 3292011443952. Its totient is φ = 2064207020544.

The previous prime is 2661541133357. The next prime is 2661541133387. The reversal of 2661541133365 is 5633311451662.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 8753660721 + 2652787472644 = 93561^2 + 1628738^2 .

It is a cyclic number.

It is not a de Polignac number, because 2661541133365 - 2³ = 2661541133357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25917544 + ... + 26020033.

It is an arithmetic number, because the mean of its divisors is an integer number (205750715247).

Almost surely, 2^{2661541133365} is an apocalyptic number.

It is an amenable number.

2661541133365 is a deficient number, since it is larger than the sum of its proper divisors (630470310587).

2661541133365 is a wasteful number, since it uses less digits than its factorization.

2661541133365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51937896.

The product of its digits is 1166400, while the sum is 46.

The spelling of 2661541133365 in words is "two trillion, six hundred sixty-one billion, five hundred forty-one million, one hundred thirty-three thousand, three hundred sixty-five".