261663203 has 4 divisors (see below), whose sum is σ = 273039888. Its totient is φ = 250286520.

The previous prime is 261663197. The next prime is 261663209. The reversal of 261663203 is 302366162.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (261663197) and next prime (261663209).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261663203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261663209) 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, 5688308 + ... + 5688353.

It is an arithmetic number, because the mean of its divisors is an integer number (68259972).

Almost surely, 2^261663203 is an apocalyptic number.

261663203 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

261663203 is a deficient number, since it is larger than the sum of its proper divisors (11376685).

261663203 is a wasteful number, since it uses less digits than its factorization.

261663203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11376684.

The product of its (nonzero) digits is 7776, while the sum is 29.

The square root of 261663203 is about 16176.0070165662. The cubic root of 261663203 is about 639.6084869447.

The spelling of 261663203 in words is "two hundred sixty-one million, six hundred sixty-three thousand, two hundred three".