261463643 has 8 divisors (see below), whose sum is σ = 299013120. Its totient is φ = 223963560.

The previous prime is 261463639. The next prime is 261463661. The reversal of 261463643 is 346364162.

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 261463643 - 2² = 261463639 is a prime.

It is a super-2 number, since 2×261463643² = 136726473221662898, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (261463603) 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, 203 + ... + 22868.

It is an arithmetic number, because the mean of its divisors is an integer number (37376640).

Almost surely, 2^261463643 is an apocalyptic number.

261463643 is a deficient number, since it is larger than the sum of its proper divisors (37549477).

261463643 is a wasteful number, since it uses less digits than its factorization.

261463643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24697.

The product of its digits is 62208, while the sum is 35.

The square root of 261463643 is about 16169.8374450704. The cubic root of 261463643 is about 639.4458443688.

The spelling of 261463643 in words is "two hundred sixty-one million, four hundred sixty-three thousand, six hundred forty-three".