6581400534 has 48 divisors (see below), whose sum is σ = 14849284320. Its totient is φ = 2104099200.

The previous prime is 6581400523. The next prime is 6581400541. The reversal of 6581400534 is 4350041856.

It is a happy number.

6581400534 is a `hidden beast` number, since 6 + 5 + 81 + 40 + 0 + 534 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 37074 + ... + 120570.

It is an arithmetic number, because the mean of its divisors is an integer number (309360090).

Almost surely, 2^6581400534 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6581400534, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7424642160).

6581400534 is an abundant number, since it is smaller than the sum of its proper divisors (8267883786).

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

6581400534 is a wasteful number, since it uses less digits than its factorization.

6581400534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83685 (or 83682 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 36.

The square root of 6581400534 is about 81125.8314841826. The cubic root of 6581400534 is about 1874.0137541812.

The spelling of 6581400534 in words is "six billion, five hundred eighty-one million, four hundred thousand, five hundred thirty-four".