536640661 has 4 divisors (see below), whose sum is σ = 538984300. Its totient is φ = 534297024.

The previous prime is 536640653. The next prime is 536640673. The reversal of 536640661 is 166046635.

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 475894225 + 60746436 = 21815^2 + 7794^2 .

It is a cyclic number.

It is not a de Polignac number, because 536640661 - 2³ = 536640653 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 536640661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (536640061) 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, 1171476 + ... + 1171933.

It is an arithmetic number, because the mean of its divisors is an integer number (134746075).

Almost surely, 2^536640661 is an apocalyptic number.

It is an amenable number.

536640661 is a deficient number, since it is larger than the sum of its proper divisors (2343639).

536640661 is a wasteful number, since it uses less digits than its factorization.

536640661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2343638.

The product of its (nonzero) digits is 77760, while the sum is 37.

The square root of 536640661 is about 23165.5058438187. The cubic root of 536640661 is about 812.6331324565.

The spelling of 536640661 in words is "five hundred thirty-six million, six hundred forty thousand, six hundred sixty-one".