2666524500985 has 4 divisors (see below), whose sum is σ = 3199829401188. Its totient is φ = 2133219600784.

The previous prime is 2666524500943. The next prime is 2666524501099. The reversal of 2666524500985 is 5890054256662.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1311274621881 + 1355249879104 = 1145109^2 + 1164152^2 .

It is a cyclic number.

It is not a de Polignac number, because 2666524500985 - 2¹⁵ = 2666524468217 is a prime.

It is a super-2 number, since 2×2666524500985² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 266652450094 + ... + 266652450103.

It is an arithmetic number, because the mean of its divisors is an integer number (799957350297).

Almost surely, 2^{2666524500985} is an apocalyptic number.

It is an amenable number.

2666524500985 is a deficient number, since it is larger than the sum of its proper divisors (533304900203).

2666524500985 is an equidigital number, since it uses as much as digits as its factorization.

2666524500985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 533304900202.

The product of its (nonzero) digits is 31104000, while the sum is 58.

The spelling of 2666524500985 in words is "two trillion, six hundred sixty-six billion, five hundred twenty-four million, five hundred thousand, nine hundred eighty-five".