261405530315 has 4 divisors (see below), whose sum is σ = 313686636384. Its totient is φ = 209124424248.

The previous prime is 261405530303. The next prime is 261405530339. The reversal of 261405530315 is 513035504162.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 513035504162 = 2 ⋅256517752081.

It is a cyclic number.

It is not a de Polignac number, because 261405530315 - 2⁴ = 261405530299 is a prime.

It is a Duffinian 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, 26140553027 + ... + 26140553036.

It is an arithmetic number, because the mean of its divisors is an integer number (78421659096).

Almost surely, 2^261405530315 is an apocalyptic number.

261405530315 is a deficient number, since it is larger than the sum of its proper divisors (52281106069).

261405530315 is an equidigital number, since it uses as much as digits as its factorization.

261405530315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52281106068.

The product of its (nonzero) digits is 54000, while the sum is 35.

The spelling of 261405530315 in words is "two hundred sixty-one billion, four hundred five million, five hundred thirty thousand, three hundred fifteen".