261145780234 has 16 divisors (see below), whose sum is σ = 418719430080. Its totient is φ = 121849567840.

The previous prime is 261145780201. The next prime is 261145780241. The reversal of 261145780234 is 432087541162.

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, 69230824 + ... + 69234595.

It is an arithmetic number, because the mean of its divisors is an integer number (26169964380).

Almost surely, 2^261145780234 is an apocalyptic number.

261145780234 is a deficient number, since it is larger than the sum of its proper divisors (157573649846).

261145780234 is a wasteful number, since it uses less digits than its factorization.

261145780234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138465485.

The product of its (nonzero) digits is 322560, while the sum is 43.

The spelling of 261145780234 in words is "two hundred sixty-one billion, one hundred forty-five million, seven hundred eighty thousand, two hundred thirty-four".