5615621999 has 4 divisors (see below), whose sum is σ = 6047592936. Its totient is φ = 5183651064.

The previous prime is 5615621989. The next prime is 5615622011. The reversal of 5615621999 is 9991265165.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 5615621999 - 2⁴ = 5615621983 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 5615621999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5615621909) 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, 215985449 + ... + 215985474.

It is an arithmetic number, because the mean of its divisors is an integer number (1511898234).

Almost surely, 2^5615621999 is an apocalyptic number.

5615621999 is a deficient number, since it is larger than the sum of its proper divisors (431970937).

5615621999 is a wasteful number, since it uses less digits than its factorization.

5615621999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 431970936.

The product of its digits is 1312200, while the sum is 53.

The square root of 5615621999 is about 74937.4539132469. The cubic root of 5615621999 is about 1777.4577602894.

The spelling of 5615621999 in words is "five billion, six hundred fifteen million, six hundred twenty-one thousand, nine hundred ninety-nine".