261492663 has 8 divisors (see below), whose sum is σ = 348834928. Its totient is φ = 174239424.

The previous prime is 261492659. The next prime is 261492667. The reversal of 261492663 is 366294162.

It is an interprime number because it is at equal distance from previous prime (261492659) and next prime (261492667).

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

It is not a de Polignac number, because 261492663 - 2² = 261492659 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261492667) 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, 15070 + ... + 27387.

It is an arithmetic number, because the mean of its divisors is an integer number (43604366).

Almost surely, 2^261492663 is an apocalyptic number.

261492663 is a deficient number, since it is larger than the sum of its proper divisors (87342265).

261492663 is a wasteful number, since it uses less digits than its factorization.

261492663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44513.

The product of its digits is 93312, while the sum is 39.

The square root of 261492663 is about 16170.7347699478. The cubic root of 261492663 is about 639.4695009808.

The spelling of 261492663 in words is "two hundred sixty-one million, four hundred ninety-two thousand, six hundred sixty-three".