263641065 has 32 divisors (see below), whose sum is σ = 441179136. Its totient is φ = 134185920.

The previous prime is 263641057. The next prime is 263641069. The reversal of 263641065 is 560146362.

It is not a de Polignac number, because 263641065 - 2³ = 263641057 is a prime.

It is a super-3 number, since 3×263641065³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (263641069) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 271030 + ... + 272000.

It is an arithmetic number, because the mean of its divisors is an integer number (13786848).

Almost surely, 2^263641065 is an apocalyptic number.

It is an amenable number.

263641065 is a deficient number, since it is larger than the sum of its proper divisors (177538071).

263641065 is a wasteful number, since it uses less digits than its factorization.

263641065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1789.

The product of its (nonzero) digits is 25920, while the sum is 33.

The square root of 263641065 is about 16237.0275912804. The cubic root of 263641065 is about 641.2160027422.

The spelling of 263641065 in words is "two hundred sixty-three million, six hundred forty-one thousand, sixty-five".