5261566401240 has 128 divisors (see below), whose sum is σ = 15994647244800. Its totient is φ = 1384464174080.

The previous prime is 5261566401239. The next prime is 5261566401251. The reversal of 5261566401240 is 421046651625.

It is a junction number, because it is equal to n+sod(n) for n = 5261566401192 and 5261566401201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7731145 + ... + 8384135.

It is an arithmetic number, because the mean of its divisors is an integer number (124958181600).

Almost surely, 2^{5261566401240} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 5261566401240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7997323622400).

5261566401240 is an abundant number, since it is smaller than the sum of its proper divisors (10733080843560).

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

5261566401240 is a wasteful number, since it uses less digits than its factorization.

5261566401240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 653897 (or 653893 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 42.

The spelling of 5261566401240 in words is "five trillion, two hundred sixty-one billion, five hundred sixty-six million, four hundred one thousand, two hundred forty".