2765166568642 has 4 divisors (see below), whose sum is σ = 4147749852966. Its totient is φ = 1382583284320.

The previous prime is 2765166568607. The next prime is 2765166568651. The reversal of 2765166568642 is 2468656615672.

It is a happy number.

It is a Cunningham number, because it is equal to 1662879²+1.

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

It can be written as a sum of positive squares in only one way, i.e., 2765166568641 + 1 = 1662879^2 + 1^2 .

It is a super-2 number, since 2×2765166568642² (a number of 26 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 691291642159 + ... + 691291642162.

Almost surely, 2^{2765166568642} is an apocalyptic number.

2765166568642 is a deficient number, since it is larger than the sum of its proper divisors (1382583284324).

2765166568642 is a wasteful number, since it uses less digits than its factorization.

2765166568642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1382583284323.

The product of its digits is 174182400, while the sum is 64.

It can be divided in two parts, 2 and 765166568642, that added together give a square (765166568644 = 874738²).

The spelling of 2765166568642 in words is "two trillion, seven hundred sixty-five billion, one hundred sixty-six million, five hundred sixty-eight thousand, six hundred forty-two".