2194057661 has 4 divisors (see below), whose sum is σ = 2309534400. Its totient is φ = 2078580924.

The previous prime is 2194057609. The next prime is 2194057667. The reversal of 2194057661 is 1667504912.

2194057661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 2194057661 - 2⁶ = 2194057597 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 (2194057667) 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, 57738341 + ... + 57738378.

It is an arithmetic number, because the mean of its divisors is an integer number (577383600).

Almost surely, 2^2194057661 is an apocalyptic number.

It is an amenable number.

2194057661 is a deficient number, since it is larger than the sum of its proper divisors (115476739).

2194057661 is a wasteful number, since it uses less digits than its factorization.

2194057661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115476738.

The product of its (nonzero) digits is 90720, while the sum is 41.

The square root of 2194057661 is about 46840.7692187052. The cubic root of 2194057661 is about 1299.4193977337.

The spelling of 2194057661 in words is "two billion, one hundred ninety-four million, fifty-seven thousand, six hundred sixty-one".