261598638414 has 16 divisors (see below), whose sum is σ = 526662161280. Its totient is φ = 86622065400.

The previous prime is 261598638407. The next prime is 261598638437. The reversal of 261598638414 is 414836895162.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 144369204 + ... + 144371015.

It is an arithmetic number, because the mean of its divisors is an integer number (32916385080).

Almost surely, 2^261598638414 is an apocalyptic number.

261598638414 is an abundant number, since it is smaller than the sum of its proper divisors (265063522866).

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

261598638414 is a wasteful number, since it uses less digits than its factorization.

261598638414 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288740375.

The product of its digits is 9953280, while the sum is 57.

The spelling of 261598638414 in words is "two hundred sixty-one billion, five hundred ninety-eight million, six hundred thirty-eight thousand, four hundred fourteen".