6621542073 has 20 divisors (see below), whose sum is σ = 10232527140. Its totient is φ = 4262140512.

The previous prime is 6621542069. The next prime is 6621542077. The reversal of 6621542073 is 3702451266.

6621542073 is a `hidden beast` number, since 6 + 621 + 5 + 4 + 20 + 7 + 3 = 666.

It is an interprime number because it is at equal distance from previous prime (6621542069) and next prime (6621542077).

It can be written as a sum of positive squares in 2 ways, for example, as 4639244544 + 1982297529 = 68112^2 + 44523^2 .

It is not a de Polignac number, because 6621542073 - 2² = 6621542069 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6621542077) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1407090 + ... + 1411787.

It is an arithmetic number, because the mean of its divisors is an integer number (511626357).

Almost surely, 2^6621542073 is an apocalyptic number.

It is an amenable number.

6621542073 is a deficient number, since it is larger than the sum of its proper divisors (3610985067).

6621542073 is a wasteful number, since it uses less digits than its factorization.

6621542073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2818918 (or 2818909 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 36.

The square root of 6621542073 is about 81372.8583312642. The cubic root of 6621542073 is about 1877.8160539042.

The spelling of 6621542073 in words is "six billion, six hundred twenty-one million, five hundred forty-two thousand, seventy-three".