261435152015 has 4 divisors (see below), whose sum is σ = 313722182424. Its totient is φ = 209148121608.

The previous prime is 261435151993. The next prime is 261435152071. The reversal of 261435152015 is 510251534162.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 510251534162 = 2 ⋅255125767081.

It is a cyclic number.

It is not a de Polignac number, because 261435152015 - 2⁸ = 261435151759 is a prime.

It is a Duffinian number.

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, 26143515197 + ... + 26143515206.

It is an arithmetic number, because the mean of its divisors is an integer number (78430545606).

Almost surely, 2^261435152015 is an apocalyptic number.

261435152015 is a deficient number, since it is larger than the sum of its proper divisors (52287030409).

261435152015 is an equidigital number, since it uses as much as digits as its factorization.

261435152015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52287030408.

The product of its (nonzero) digits is 36000, while the sum is 35.

Adding to 261435152015 its reverse (510251534162), we get a palindrome (771686686177).

The spelling of 261435152015 in words is "two hundred sixty-one billion, four hundred thirty-five million, one hundred fifty-two thousand, fifteen".