261338680438 has 16 divisors (see below), whose sum is σ = 430477205760. Its totient is φ = 118003617000.

The previous prime is 261338680417. The next prime is 261338680439. The reversal of 261338680438 is 834086833162.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261338680439) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39331218 + ... + 39337861.

It is an arithmetic number, because the mean of its divisors is an integer number (26904825360).

Almost surely, 2^261338680438 is an apocalyptic number.

261338680438 is a deficient number, since it is larger than the sum of its proper divisors (169138525322).

261338680438 is a wasteful number, since it uses less digits than its factorization.

261338680438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78669243.

The product of its (nonzero) digits is 3981312, while the sum is 52.

The spelling of 261338680438 in words is "two hundred sixty-one billion, three hundred thirty-eight million, six hundred eighty thousand, four hundred thirty-eight".