261655502006115 has 64 divisors (see below), whose sum is σ = 531634389120000. Its totient is φ = 119610149997312.

The previous prime is 261655502006089. The next prime is 261655502006141. The reversal of 261655502006115 is 511600205556162.

It is a happy number.

261655502006115 is a `hidden beast` number, since 2 + 6 + 1 + 6 + 5 + 5 + 5 + 0 + 20 + 0 + 611 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (261655502006089) and next prime (261655502006141).

It is not a de Polignac number, because 261655502006115 - 2⁷ = 261655502005987 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 25527511 + ... + 34277759.

It is an arithmetic number, because the mean of its divisors is an integer number (8306787330000).

Almost surely, 2^{261655502006115} is an apocalyptic number.

261655502006115 is an abundant number, since it is smaller than the sum of its proper divisors (269978887113885).

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

261655502006115 is a wasteful number, since it uses less digits than its factorization.

261655502006115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8781913 (or 8781907 counting only the distinct ones).

The product of its (nonzero) digits is 540000, while the sum is 45.

The spelling of 261655502006115 in words is "two hundred sixty-one trillion, six hundred fifty-five billion, five hundred two million, six thousand, one hundred fifteen".