261626345 has 16 divisors (see below), whose sum is σ = 332926848. Its totient is φ = 196688640.

The previous prime is 261626341. The next prime is 261626347. The reversal of 261626345 is 543626162.

It is a happy number.

It is not a de Polignac number, because 261626345 - 2² = 261626341 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261626341) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64940 + ... + 68850.

It is an arithmetic number, because the mean of its divisors is an integer number (20807928).

Almost surely, 2^261626345 is an apocalyptic number.

It is an amenable number.

261626345 is a deficient number, since it is larger than the sum of its proper divisors (71300503).

261626345 is a wasteful number, since it uses less digits than its factorization.

261626345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4720.

The product of its digits is 51840, while the sum is 35.

The square root of 261626345 is about 16174.8676965223. The cubic root of 261626345 is about 639.5784536852.

The spelling of 261626345 in words is "two hundred sixty-one million, six hundred twenty-six thousand, three hundred forty-five".