2660521326566 has 4 divisors (see below), whose sum is σ = 3990781989852. Its totient is φ = 1330260663282.

The previous prime is 2660521326559. The next prime is 2660521326571. The reversal of 2660521326566 is 6656231250662.

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

It is a super-2 number, since 2×2660521326566² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665130331640 + ... + 665130331643.

It is an arithmetic number, because the mean of its divisors is an integer number (997695497463).

Almost surely, 2^{2660521326566} is an apocalyptic number.

2660521326566 is a deficient number, since it is larger than the sum of its proper divisors (1330260663286).

2660521326566 is a wasteful number, since it uses less digits than its factorization.

2660521326566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1330260663285.

The product of its (nonzero) digits is 4665600, while the sum is 50.

The spelling of 2660521326566 in words is "two trillion, six hundred sixty billion, five hundred twenty-one million, three hundred twenty-six thousand, five hundred sixty-six".