6554640021 has 8 divisors (see below), whose sum is σ = 8975723424. Its totient is φ = 4251658320.

The previous prime is 6554640019. The next prime is 6554640067. The reversal of 6554640021 is 1200464556.

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

It is not a de Polignac number, because 6554640021 - 2¹ = 6554640019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6554640011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29525295 + ... + 29525516.

It is an arithmetic number, because the mean of its divisors is an integer number (1121965428).

Almost surely, 2^6554640021 is an apocalyptic number.

It is an amenable number.

6554640021 is a deficient number, since it is larger than the sum of its proper divisors (2421083403).

6554640021 is a wasteful number, since it uses less digits than its factorization.

6554640021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59050851.

The product of its (nonzero) digits is 28800, while the sum is 33.

The square root of 6554640021 is about 80960.7313516868. The cubic root of 6554640021 is about 1871.4703394029.

The spelling of 6554640021 in words is "six billion, five hundred fifty-four million, six hundred forty thousand, twenty-one".