5515665421 has 8 divisors (see below), whose sum is σ = 6506960384. Its totient is φ = 4575206160.

The previous prime is 5515665383. The next prime is 5515665431. The reversal of 5515665421 is 1245665155.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-5515665421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5515665431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12708690 + ... + 12709123.

It is an arithmetic number, because the mean of its divisors is an integer number (813370048).

Almost surely, 2^5515665421 is an apocalyptic number.

It is an amenable number.

5515665421 is a deficient number, since it is larger than the sum of its proper divisors (991294963).

5515665421 is a wasteful number, since it uses less digits than its factorization.

5515665421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25417851.

The product of its digits is 180000, while the sum is 40.

The square root of 5515665421 is about 74267.5260191155. The cubic root of 5515665421 is about 1766.8484697482.

The spelling of 5515665421 in words is "five billion, five hundred fifteen million, six hundred sixty-five thousand, four hundred twenty-one".