261340715400 has 192 divisors, whose sum is σ = 856964257920. Its totient is φ = 65747404800.

The previous prime is 261340715381. The next prime is 261340715401. The reversal of 261340715400 is 4517043162.

It is not an unprimeable number, because it can be changed into a prime (261340715401) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 877690 + ... + 1137110.

It is an arithmetic number, because the mean of its divisors is an integer number (4463355510).

Almost surely, 2^261340715400 is an apocalyptic number.

261340715400 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 261340715400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (428482128960).

261340715400 is an abundant number, since it is smaller than the sum of its proper divisors (595623542520).

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

261340715400 is a wasteful number, since it uses less digits than its factorization.

261340715400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259536 (or 259527 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 33.

Adding to 261340715400 its reverse (4517043162), we get a palindrome (265857758562).

The spelling of 261340715400 in words is "two hundred sixty-one billion, three hundred forty million, seven hundred fifteen thousand, four hundred".