261611407340 has 48 divisors (see below), whose sum is σ = 551639531520. Its totient is φ = 104215174080.

The previous prime is 261611407333. The next prime is 261611407373. The reversal of 261611407340 is 43704116162.

It is a self number, because there is not a number n which added to its sum of digits gives 261611407340.

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, 25868885 + ... + 25878995.

It is an arithmetic number, because the mean of its divisors is an integer number (11492490240).

Almost surely, 2^261611407340 is an apocalyptic number.

261611407340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261611407340 is an abundant number, since it is smaller than the sum of its proper divisors (290028124180).

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

261611407340 is a wasteful number, since it uses less digits than its factorization.

261611407340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15302 (or 15300 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 35.

The spelling of 261611407340 in words is "two hundred sixty-one billion, six hundred eleven million, four hundred seven thousand, three hundred forty".