2275640661 has 16 divisors (see below), whose sum is σ = 3503394944. Its totient is φ = 1286959104.

The previous prime is 2275640641. The next prime is 2275640699. The reversal of 2275640661 is 1660465722.

It is not a de Polignac number, because 2275640661 - 2⁵ = 2275640629 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2275640611) 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, 556540 + ... + 560613.

It is an arithmetic number, because the mean of its divisors is an integer number (218962184).

Almost surely, 2^2275640661 is an apocalyptic number.

2275640661 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2275640661 is a deficient number, since it is larger than the sum of its proper divisors (1227754283).

2275640661 is a wasteful number, since it uses less digits than its factorization.

2275640661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1117260.

The product of its (nonzero) digits is 120960, while the sum is 39.

The square root of 2275640661 is about 47703.6755502131. The cubic root of 2275640661 is about 1315.3295036110.

The spelling of 2275640661 in words is "two billion, two hundred seventy-five million, six hundred forty thousand, six hundred sixty-one".