260401563640 has 64 divisors (see below), whose sum is σ = 606359520000. Its totient is φ = 100541291520.

The previous prime is 260401563623. The next prime is 260401563659. The reversal of 260401563640 is 46365104062.

It is a self number, because there is not a number n which added to its sum of digits gives 260401563640.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 212436 + ... + 752284.

It is an arithmetic number, because the mean of its divisors is an integer number (9474367500).

Almost surely, 2^260401563640 is an apocalyptic number.

260401563640 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 260401563640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (303179760000).

260401563640 is an abundant number, since it is smaller than the sum of its proper divisors (345957956360).

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

260401563640 is a wasteful number, since it uses less digits than its factorization.

260401563640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 540280 (or 540276 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 37.

The spelling of 260401563640 in words is "two hundred sixty billion, four hundred one million, five hundred sixty-three thousand, six hundred forty".