5821540665 has 16 divisors (see below), whose sum is σ = 9315837888. Its totient is φ = 3104364096.

The previous prime is 5821540661. The next prime is 5821540691. The reversal of 5821540665 is 5660451285.

It is not a de Polignac number, because 5821540665 - 2² = 5821540661 is a prime.

It is not an unprimeable number, because it can be changed into a prime (5821540661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 93339 + ... + 142671.

It is an arithmetic number, because the mean of its divisors is an integer number (582239868).

Almost surely, 2^5821540665 is an apocalyptic number.

It is an amenable number.

5821540665 is a deficient number, since it is larger than the sum of its proper divisors (3494297223).

5821540665 is a wasteful number, since it uses less digits than its factorization.

5821540665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57208.

The product of its (nonzero) digits is 288000, while the sum is 42.

The square root of 5821540665 is about 76299.0213895303. The cubic root of 5821540665 is about 1798.9232928022.

The spelling of 5821540665 in words is "five billion, eight hundred twenty-one million, five hundred forty thousand, six hundred sixty-five".