261407650336 has 48 divisors (see below), whose sum is σ = 622765293696. Its totient is φ = 105441739776.

The previous prime is 261407650313. The next prime is 261407650397. The reversal of 261407650336 is 633056704162.

It is a junction number, because it is equal to n+sod(n) for n = 261407650292 and 261407650301.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34319676 + ... + 34327291.

It is an arithmetic number, because the mean of its divisors is an integer number (12974276952).

Almost surely, 2^261407650336 is an apocalyptic number.

It is an amenable number.

261407650336 is an abundant number, since it is smaller than the sum of its proper divisors (361357643360).

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

261407650336 is a wasteful number, since it uses less digits than its factorization.

261407650336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68647001 (or 68646993 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 43.

The spelling of 261407650336 in words is "two hundred sixty-one billion, four hundred seven million, six hundred fifty thousand, three hundred thirty-six".