261115966087 has 8 divisors (see below), whose sum is σ = 276524755632. Its totient is φ = 245712624000.

The previous prime is 261115966057. The next prime is 261115966117. The reversal of 261115966087 is 780669511162.

It is an interprime number because it is at equal distance from previous prime (261115966057) and next prime (261115966117).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261115966087 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261115966057) 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, 1262964 + ... + 1455097.

It is an arithmetic number, because the mean of its divisors is an integer number (34565594454).

Almost surely, 2^261115966087 is an apocalyptic number.

261115966087 is a deficient number, since it is larger than the sum of its proper divisors (15408789545).

261115966087 is a wasteful number, since it uses less digits than its factorization.

261115966087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2723729.

The product of its (nonzero) digits is 1088640, while the sum is 52.

The spelling of 261115966087 in words is "two hundred sixty-one billion, one hundred fifteen million, nine hundred sixty-six thousand, eighty-seven".