261745729206 has 16 divisors (see below), whose sum is σ = 563760032304. Its totient is φ = 80537147424.

The previous prime is 261745729123. The next prime is 261745729213. The reversal of 261745729206 is 602927547162.

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, 1677857161 + ... + 1677857316.

It is an arithmetic number, because the mean of its divisors is an integer number (35235002019).

Almost surely, 2^261745729206 is an apocalyptic number.

261745729206 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

261745729206 is an abundant number, since it is smaller than the sum of its proper divisors (302014303098).

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

261745729206 is a wasteful number, since it uses less digits than its factorization.

261745729206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3355714495.

The product of its (nonzero) digits is 2540160, while the sum is 51.

The spelling of 261745729206 in words is "two hundred sixty-one billion, seven hundred forty-five million, seven hundred twenty-nine thousand, two hundred six".