261138281308 has 6 divisors (see below), whose sum is σ = 456991992296. Its totient is φ = 130569140652.

The previous prime is 261138281303. The next prime is 261138281317. The reversal of 261138281308 is 803182831162.

It is a super-2 number, since 2×261138281308² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261138281303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32642285160 + ... + 32642285167.

Almost surely, 2^261138281308 is an apocalyptic number.

It is an amenable number.

261138281308 is a deficient number, since it is larger than the sum of its proper divisors (195853710988).

261138281308 is a wasteful number, since it uses less digits than its factorization.

261138281308 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65284570331 (or 65284570329 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 43.

The spelling of 261138281308 in words is "two hundred sixty-one billion, one hundred thirty-eight million, two hundred eighty-one thousand, three hundred eight".