2053917661 has 4 divisors (see below), whose sum is σ = 2101683232. Its totient is φ = 2006152092.

The previous prime is 2053917647. The next prime is 2053917667. The reversal of 2053917661 is 1667193502.

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 a cyclic number.

It is not a de Polignac number, because 2053917661 - 2⁹ = 2053917149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2053917667) 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, 23882721 + ... + 23882806.

It is an arithmetic number, because the mean of its divisors is an integer number (525420808).

Almost surely, 2^2053917661 is an apocalyptic number.

It is an amenable number.

2053917661 is a deficient number, since it is larger than the sum of its proper divisors (47765571).

2053917661 is an equidigital number, since it uses as much as digits as its factorization.

2053917661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47765570.

The product of its (nonzero) digits is 68040, while the sum is 40.

The square root of 2053917661 is about 45320.1683690606. The cubic root of 2053917661 is about 1271.1428035728.

The spelling of 2053917661 in words is "two billion, fifty-three million, nine hundred seventeen thousand, six hundred sixty-one".