2661143562535 has 4 divisors (see below), whose sum is σ = 3193372275048. Its totient is φ = 2128914850024.

The previous prime is 2661143562533. The next prime is 2661143562547. The reversal of 2661143562535 is 5352653411662.

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

It is a cyclic number.

It is not a de Polignac number, because 2661143562535 - 2¹ = 2661143562533 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2661143562533) 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, 266114356249 + ... + 266114356258.

It is an arithmetic number, because the mean of its divisors is an integer number (798343068762).

Almost surely, 2^{2661143562535} is an apocalyptic number.

2661143562535 is a deficient number, since it is larger than the sum of its proper divisors (532228712513).

2661143562535 is an equidigital number, since it uses as much as digits as its factorization.

2661143562535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 532228712512.

The product of its digits is 3888000, while the sum is 49.

The spelling of 2661143562535 in words is "two trillion, six hundred sixty-one billion, one hundred forty-three million, five hundred sixty-two thousand, five hundred thirty-five".