259286381640 has 640 divisors, whose sum is σ = 1043265484800. Its totient is φ = 56921978880.

The previous prime is 259286381623. The next prime is 259286381687. The reversal of 259286381640 is 46183682952.

259286381640 is a `hidden beast` number, since 2 + 592 + 8 + 6 + 3 + 8 + 1 + 6 + 40 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 24550681 + ... + 24561239.

It is an arithmetic number, because the mean of its divisors is an integer number (1630102320).

Almost surely, 2^259286381640 is an apocalyptic number.

259286381640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 259286381640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (521632742400).

259286381640 is an abundant number, since it is smaller than the sum of its proper divisors (783979103160).

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

259286381640 is a wasteful number, since it uses less digits than its factorization.

259286381640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10659 (or 10646 counting only the distinct ones).

The product of its (nonzero) digits is 4976640, while the sum is 54.

The spelling of 259286381640 in words is "two hundred fifty-nine billion, two hundred eighty-six million, three hundred eighty-one thousand, six hundred forty".