261920707860 has 48 divisors (see below), whose sum is σ = 838146266496. Its totient is φ = 59867590272.

The previous prime is 261920707831. The next prime is 261920707861. The reversal of 261920707860 is 68707029162.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261920707861) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 311809947 + ... + 311810786.

It is an arithmetic number, because the mean of its divisors is an integer number (17461380552).

Almost surely, 2^261920707860 is an apocalyptic number.

261920707860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261920707860 is an abundant number, since it is smaller than the sum of its proper divisors (576225558636).

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

261920707860 is a wasteful number, since it uses less digits than its factorization.

261920707860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 623620752 (or 623620750 counting only the distinct ones).

The product of its (nonzero) digits is 508032, while the sum is 48.

The spelling of 261920707860 in words is "two hundred sixty-one billion, nine hundred twenty million, seven hundred seven thousand, eight hundred sixty".