261426034664310 has 128 divisors (see below), whose sum is σ = 647241564211200. Its totient is φ = 67535745408000.

The previous prime is 261426034664261. The next prime is 261426034664341. The reversal of 261426034664310 is 13466430624162.

It is a super-2 number, since 2×261426034664310² (a number of 30 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 261426034664310.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 464601016 + ... + 465163364.

It is an arithmetic number, because the mean of its divisors is an integer number (5056574720400).

Almost surely, 2^{261426034664310} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 261426034664310, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (323620782105600).

261426034664310 is an abundant number, since it is smaller than the sum of its proper divisors (385815529546890).

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

261426034664310 is a wasteful number, since it uses less digits than its factorization.

261426034664310 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 565054.

The product of its (nonzero) digits is 2985984, while the sum is 48.

The spelling of 261426034664310 in words is "two hundred sixty-one trillion, four hundred twenty-six billion, thirty-four million, six hundred sixty-four thousand, three hundred ten".