6651045621 has 32 divisors (see below), whose sum is σ = 10773642240. Its totient is φ = 4021758000.

The previous prime is 6651045619. The next prime is 6651045673. The reversal of 6651045621 is 1265401566.

It is not a de Polignac number, because 6651045621 - 2¹ = 6651045619 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6651045521) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 106296 + ... + 156846.

It is an arithmetic number, because the mean of its divisors is an integer number (336676320).

Almost surely, 2^6651045621 is an apocalyptic number.

It is an amenable number.

6651045621 is a deficient number, since it is larger than the sum of its proper divisors (4122596619).

6651045621 is a wasteful number, since it uses less digits than its factorization.

6651045621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51014 (or 51008 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The square root of 6651045621 is about 81553.9430131983. The cubic root of 6651045621 is about 1880.6009114427.

The spelling of 6651045621 in words is "six billion, six hundred fifty-one million, forty-five thousand, six hundred twenty-one".