261660200 has 24 divisors (see below), whose sum is σ = 608360430. Its totient is φ = 104664000.

The previous prime is 261660197. The next prime is 261660227. The reversal of 261660200 is 2066162.

261660200 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 218862436 + 42797764 = 14794^2 + 6542^2 .

It is a hoax number, since the sum of its digits (23) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 653951 + ... + 654350.

Almost surely, 2^261660200 is an apocalyptic number.

261660200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261660200 is an abundant number, since it is smaller than the sum of its proper divisors (346700230).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261660200 is a wasteful number, since it uses less digits than its factorization.

261660200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1308317 (or 1308308 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 261660200 is about 16175.9141936399. The cubic root of 261660200 is about 639.6060400950.

The spelling of 261660200 in words is "two hundred sixty-one million, six hundred sixty thousand, two hundred".