2665401401 has 4 divisors (see below), whose sum is σ = 2870432292. Its totient is φ = 2460370512.

The previous prime is 2665401341. The next prime is 2665401407. The reversal of 2665401401 is 1041045662.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1041045662 = 2 ⋅520522831.

It can be written as a sum of positive squares in 2 ways, for example, as 161900176 + 2503501225 = 12724^2 + 50035^2 .

It is a cyclic number.

It is not a de Polignac number, because 2665401401 - 2⁶ = 2665401337 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2665401407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 102515426 + ... + 102515451.

It is an arithmetic number, because the mean of its divisors is an integer number (717608073).

Almost surely, 2^2665401401 is an apocalyptic number.

It is an amenable number.

2665401401 is a deficient number, since it is larger than the sum of its proper divisors (205030891).

2665401401 is a wasteful number, since it uses less digits than its factorization.

2665401401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205030890.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 2665401401 is about 51627.5256137654. The cubic root of 2665401401 is about 1386.5031924509.

The spelling of 2665401401 in words is "two billion, six hundred sixty-five million, four hundred one thousand, four hundred one".