2397736661 has 4 divisors (see below), whose sum is σ = 2538780012. Its totient is φ = 2256693312.

The previous prime is 2397736643. The next prime is 2397736681. The reversal of 2397736661 is 1666377932.

It is a happy number.

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 649995025 + 1747741636 = 25495^2 + 41806^2 .

It is a cyclic number.

It is not a de Polignac number, because 2397736661 - 2¹⁴ = 2397720277 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 (2397736681) 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, 70521650 + ... + 70521683.

It is an arithmetic number, because the mean of its divisors is an integer number (634695003).

Almost surely, 2^2397736661 is an apocalyptic number.

It is an amenable number.

2397736661 is a deficient number, since it is larger than the sum of its proper divisors (141043351).

2397736661 is a wasteful number, since it uses less digits than its factorization.

2397736661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141043350.

The product of its digits is 1714608, while the sum is 50.

The square root of 2397736661 is about 48966.6892999721. The cubic root of 2397736661 is about 1338.4448917627. Note that the first 3 decimals are identical.

The spelling of 2397736661 in words is "two billion, three hundred ninety-seven million, seven hundred thirty-six thousand, six hundred sixty-one".