261553622 has 16 divisors (see below), whose sum is σ = 436074192. Its totient is φ = 116644320.

The previous prime is 261553609. The next prime is 261553661. The reversal of 261553622 is 226355162.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 110993 + ... + 113324.

It is an arithmetic number, because the mean of its divisors is an integer number (27254637).

Almost surely, 2^261553622 is an apocalyptic number.

261553622 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

261553622 is a deficient number, since it is larger than the sum of its proper divisors (174520570).

261553622 is a wasteful number, since it uses less digits than its factorization.

261553622 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224383.

The product of its digits is 21600, while the sum is 32.

The square root of 261553622 is about 16172.6195157124. The cubic root of 261553622 is about 639.5191880251.

The spelling of 261553622 in words is "two hundred sixty-one million, five hundred fifty-three thousand, six hundred twenty-two".