2196007661 has 4 divisors (see below), whose sum is σ = 2212037052. Its totient is φ = 2179978272.

The previous prime is 2196007651. The next prime is 2196007663. The reversal of 2196007661 is 1667006912.

2196007661 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.

It can be written as a sum of positive squares in 2 ways, for example, as 449185636 + 1746822025 = 21194^2 + 41795^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2196007661 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2196007663) 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, 8014490 + ... + 8014763.

It is an arithmetic number, because the mean of its divisors is an integer number (553009263).

Almost surely, 2^2196007661 is an apocalyptic number.

It is an amenable number.

2196007661 is a deficient number, since it is larger than the sum of its proper divisors (16029391).

2196007661 is a wasteful number, since it uses less digits than its factorization.

2196007661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16029390.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 2196007661 is about 46861.5797962467. The cubic root of 2196007661 is about 1299.8042429105.

The spelling of 2196007661 in words is "two billion, one hundred ninety-six million, seven thousand, six hundred sixty-one".