261304370459540 has 12 divisors (see below), whose sum is σ = 548739177965076. Its totient is φ = 104521748183808.

The previous prime is 261304370459537. The next prime is 261304370459579. The reversal of 261304370459540 is 45954073403162.

It can be written as a sum of positive squares in 2 ways, for example, as 163671237080836 + 97633133378704 = 12793406^2 + 9880948^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6532609261469 + ... + 6532609261508.

It is an arithmetic number, because the mean of its divisors is an integer number (45728264830423).

Almost surely, 2^{261304370459540} is an apocalyptic number.

261304370459540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261304370459540 is an abundant number, since it is smaller than the sum of its proper divisors (287434807505536).

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

261304370459540 is a wasteful number, since it uses less digits than its factorization.

261304370459540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13065218522986 (or 13065218522984 counting only the distinct ones).

The product of its (nonzero) digits is 10886400, while the sum is 53.

The spelling of 261304370459540 in words is "two hundred sixty-one trillion, three hundred four billion, three hundred seventy million, four hundred fifty-nine thousand, five hundred forty".