261664046 has 8 divisors (see below), whose sum is σ = 448566960. Its totient is φ = 112141728.

The previous prime is 261664019. The next prime is 261664049. The reversal of 261664046 is 640466162.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 261663997 and 261664015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261664049) 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, 9345131 + ... + 9345158.

It is an arithmetic number, because the mean of its divisors is an integer number (56070870).

Almost surely, 2^261664046 is an apocalyptic number.

261664046 is a deficient number, since it is larger than the sum of its proper divisors (186902914).

261664046 is a wasteful number, since it uses less digits than its factorization.

261664046 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18690298.

The product of its (nonzero) digits is 41472, while the sum is 35.

The square root of 261664046 is about 16176.0330736556. The cubic root of 261664046 is about 639.6091738193.

The spelling of 261664046 in words is "two hundred sixty-one million, six hundred sixty-four thousand, forty-six".