2681561953 has 4 divisors (see below), whose sum is σ = 3064642240. Its totient is φ = 2298481668.

The previous prime is 2681561951. The next prime is 2681561957. The reversal of 2681561953 is 3591651862.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 2681561953 - 2¹ = 2681561951 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2681561951) 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, 191540133 + ... + 191540146.

It is an arithmetic number, because the mean of its divisors is an integer number (766160560).

Almost surely, 2^2681561953 is an apocalyptic number.

It is an amenable number.

2681561953 is a deficient number, since it is larger than the sum of its proper divisors (383080287).

2681561953 is an equidigital number, since it uses as much as digits as its factorization.

2681561953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 383080286.

The product of its digits is 388800, while the sum is 46.

The square root of 2681561953 is about 51783.8001019624. The cubic root of 2681561953 is about 1389.2997098751.

The spelling of 2681561953 in words is "two billion, six hundred eighty-one million, five hundred sixty-one thousand, nine hundred fifty-three".