640526186832 has 160 divisors (see below), whose sum is σ = 1923943526400. Its totient is φ = 179829517824.

The previous prime is 640526186821. The next prime is 640526186851. The reversal of 640526186832 is 238681625046.

It is a super-3 number, since 3×640526186832³ (a number of 36 digits) contains 333 as substring.

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, 60200169 + ... + 60210807.

It is an arithmetic number, because the mean of its divisors is an integer number (12024647040).

Almost surely, 2^640526186832 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 640526186832, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (961971763200).

640526186832 is an abundant number, since it is smaller than the sum of its proper divisors (1283417339568).

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

640526186832 is a wasteful number, since it uses less digits than its factorization.

640526186832 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13753 (or 13747 counting only the distinct ones).

The product of its (nonzero) digits is 3317760, while the sum is 51.

The spelling of 640526186832 in words is "six hundred forty billion, five hundred twenty-six million, one hundred eighty-six thousand, eight hundred thirty-two".