263868761 has 4 divisors (see below), whose sum is σ = 284166372. Its totient is φ = 243571152.

The previous prime is 263868757. The next prime is 263868797. The reversal of 263868761 is 167868362.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 167868362 = 2 ⋅83934181.

It can be written as a sum of positive squares in 2 ways, for example, as 39438400 + 224430361 = 6280^2 + 14981^2 .

It is a cyclic number.

It is not a de Polignac number, because 263868761 - 2² = 263868757 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (263868701) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10148786 + ... + 10148811.

It is an arithmetic number, because the mean of its divisors is an integer number (71041593).

Almost surely, 2^263868761 is an apocalyptic number.

It is an amenable number.

263868761 is a deficient number, since it is larger than the sum of its proper divisors (20297611).

263868761 is a wasteful number, since it uses less digits than its factorization.

263868761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20297610.

The product of its digits is 580608, while the sum is 47.

The square root of 263868761 is about 16244.0377061862. The cubic root of 263868761 is about 641.4005469659.

The spelling of 263868761 in words is "two hundred sixty-three million, eight hundred sixty-eight thousand, seven hundred sixty-one".