261606611 has 8 divisors (see below), whose sum is σ = 314714880. Its totient is φ = 212432328.

The previous prime is 261606599. The next prime is 261606617. The reversal of 261606611 is 116606162.

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

It is a cyclic number.

It is not a de Polignac number, because 261606611 - 2¹⁴ = 261590227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261606617) 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, 983351 + ... + 983616.

It is an arithmetic number, because the mean of its divisors is an integer number (39339360).

Almost surely, 2^261606611 is an apocalyptic number.

261606611 is a deficient number, since it is larger than the sum of its proper divisors (53108269).

261606611 is a wasteful number, since it uses less digits than its factorization.

261606611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1966993.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 261606611 is about 16174.2576645730. The cubic root of 261606611 is about 639.5623725339.

The spelling of 261606611 in words is "two hundred sixty-one million, six hundred six thousand, six hundred eleven".