5258556666 has 96 divisors (see below), whose sum is σ = 12947773440. Its totient is φ = 1580705280.

The previous prime is 5258556649. The next prime is 5258556683. The reversal of 5258556666 is 6666558525.

It is an interprime number because it is at equal distance from previous prime (5258556649) and next prime (5258556683).

It is a Harshad number since it is a multiple of its sum of digits (54).

Its product of digits (12960000) is a multiple of the sum of its prime divisors (6480).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 826650 + ... + 832986.

It is an arithmetic number, because the mean of its divisors is an integer number (134872640).

Almost surely, 2^5258556666 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 5258556666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6473886720).

5258556666 is an abundant number, since it is smaller than the sum of its proper divisors (7689216774).

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

5258556666 is a wasteful number, since it uses less digits than its factorization.

5258556666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6497 (or 6480 counting only the distinct ones).

The product of its digits is 12960000, while the sum is 54.

The square root of 5258556666 is about 72515.9062964809. The cubic root of 5258556666 is about 1738.9570384663.

The spelling of 5258556666 in words is "five billion, two hundred fifty-eight million, five hundred fifty-six thousand, six hundred sixty-six".