2666520642 has 16 divisors (see below), whose sum is σ = 5335544160. Its totient is φ = 888423072.

The previous prime is 2666520503. The next prime is 2666520643. The reversal of 2666520642 is 2460256662.

It is a super-2 number, since 2×2666520642² = 14220664668424184328, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2666520642.

It is not an unprimeable number, because it can be changed into a prime (2666520643) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 90292 + ... + 116127.

It is an arithmetic number, because the mean of its divisors is an integer number (333471510).

Almost surely, 2^2666520642 is an apocalyptic number.

2666520642 is an abundant number, since it is smaller than the sum of its proper divisors (2669023518).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2666520642 is a wasteful number, since it uses less digits than its factorization.

2666520642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208577.

The product of its (nonzero) digits is 207360, while the sum is 39.

The square root of 2666520642 is about 51638.3640523206. The cubic root of 2666520642 is about 1386.6972362770.

The spelling of 2666520642 in words is "two billion, six hundred sixty-six million, five hundred twenty thousand, six hundred forty-two".