2661630197 has 4 divisors (see below), whose sum is σ = 2664192960. Its totient is φ = 2659067436.

The previous prime is 2661630133. The next prime is 2661630199. The reversal of 2661630197 is 7910361662.

2661630197 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 a cyclic number.

It is not a de Polignac number, because 2661630197 - 2⁶ = 2661630133 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 (2661630199) 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, 1279823 + ... + 1281900.

It is an arithmetic number, because the mean of its divisors is an integer number (666048240).

Almost surely, 2^2661630197 is an apocalyptic number.

It is an amenable number.

2661630197 is a deficient number, since it is larger than the sum of its proper divisors (2562763).

2661630197 is a wasteful number, since it uses less digits than its factorization.

2661630197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2562762.

The product of its (nonzero) digits is 81648, while the sum is 41.

The square root of 2661630197 is about 51590.9894942906. The cubic root of 2661630197 is about 1385.8489752479.

The spelling of 2661630197 in words is "two billion, six hundred sixty-one million, six hundred thirty thousand, one hundred ninety-seven".