2566421636752 has 20 divisors (see below), whose sum is σ = 5188635048960. Its totient is φ = 1227419043488.

The previous prime is 2566421636749. The next prime is 2566421636759. The reversal of 2566421636752 is 2576361246652.

It is a junction number, because it is equal to n+sod(n) for n = 2566421636693 and 2566421636702.

It is not an unprimeable number, because it can be changed into a prime (2566421636759) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3486985552 + ... + 3486986287.

It is an arithmetic number, because the mean of its divisors is an integer number (259431752448).

Almost surely, 2^{2566421636752} is an apocalyptic number.

It is an amenable number.

2566421636752 is an abundant number, since it is smaller than the sum of its proper divisors (2622213412208).

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

2566421636752 is a wasteful number, since it uses less digits than its factorization.

2566421636752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6973971870 (or 6973971864 counting only the distinct ones).

The product of its digits is 21772800, while the sum is 55.

The spelling of 2566421636752 in words is "two trillion, five hundred sixty-six billion, four hundred twenty-one million, six hundred thirty-six thousand, seven hundred fifty-two".