261328780274 has 16 divisors (see below), whose sum is σ = 407317848576. Its totient is φ = 125611992000.

The previous prime is 261328780267. The next prime is 261328780291. The reversal of 261328780274 is 472087823162.

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, 13947527 + ... + 13966250.

It is an arithmetic number, because the mean of its divisors is an integer number (25457365536).

Almost surely, 2^261328780274 is an apocalyptic number.

261328780274 is a deficient number, since it is larger than the sum of its proper divisors (145989068302).

261328780274 is a wasteful number, since it uses less digits than its factorization.

261328780274 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27913961.

The product of its (nonzero) digits is 1806336, while the sum is 50.

The spelling of 261328780274 in words is "two hundred sixty-one billion, three hundred twenty-eight million, seven hundred eighty thousand, two hundred seventy-four".