261675651 has 4 divisors (see below), whose sum is σ = 348900872. Its totient is φ = 174450432.

The previous prime is 261675637. The next prime is 261675697. The reversal of 261675651 is 156576162.

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

It is not a de Polignac number, because 261675651 - 2⁶ = 261675587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261675851) 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, 43612606 + ... + 43612611.

It is an arithmetic number, because the mean of its divisors is an integer number (87225218).

Almost surely, 2^261675651 is an apocalyptic number.

261675651 is a deficient number, since it is larger than the sum of its proper divisors (87225221).

261675651 is an equidigital number, since it uses as much as digits as its factorization.

261675651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87225220.

The product of its digits is 75600, while the sum is 39.

The square root of 261675651 is about 16176.3917793802. The cubic root of 261675651 is about 639.6186293977.

The spelling of 261675651 in words is "two hundred sixty-one million, six hundred seventy-five thousand, six hundred fifty-one".