2520126666 has 24 divisors (see below), whose sum is σ = 5461291524. Its totient is φ = 839885760.

The previous prime is 2520126641. The next prime is 2520126667. The reversal of 2520126666 is 6666210252.

It can be written as a sum of positive squares in 2 ways, for example, as 2364001641 + 156125025 = 48621^2 + 12495^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 2520126666.

It is not an unprimeable number, because it can be changed into a prime (2520126667) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 126840 + ... + 145356.

Almost surely, 2^2520126666 is an apocalyptic number.

2520126666 is an abundant number, since it is smaller than the sum of its proper divisors (2941164858).

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

2520126666 is a wasteful number, since it uses less digits than its factorization.

2520126666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26086 (or 26083 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 2520126666 is about 50200.8631997499. The cubic root of 2520126666 is about 1360.8412229973.

The spelling of 2520126666 in words is "two billion, five hundred twenty million, one hundred twenty-six thousand, six hundred sixty-six".