2661432401 has 4 divisors (see below), whose sum is σ = 2661791412. Its totient is φ = 2661073392.

The previous prime is 2661432289. The next prime is 2661432409. The reversal of 2661432401 is 1042341662.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2282546176 + 378886225 = 47776^2 + 19465^2 .

It is a cyclic number.

It is not a de Polignac number, because 2661432401 - 2¹⁸ = 2661170257 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2661432409) 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, 168146 + ... + 183291.

It is an arithmetic number, because the mean of its divisors is an integer number (665447853).

Almost surely, 2^2661432401 is an apocalyptic number.

It is an amenable number.

2661432401 is a deficient number, since it is larger than the sum of its proper divisors (359011).

2661432401 is an equidigital number, since it uses as much as digits as its factorization.

2661432401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 359010.

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 2661432401 is about 51589.0724960238. The cubic root of 2661432401 is about 1385.8146451376.

The spelling of 2661432401 in words is "two billion, six hundred sixty-one million, four hundred thirty-two thousand, four hundred one".