6621520041 has 10 divisors (see below), whose sum is σ = 9891406602. Its totient is φ = 4414346640.

The previous prime is 6621519977. The next prime is 6621520057. The reversal of 6621520041 is 1400251266.

It can be written as a sum of positive squares in only one way, i.e., 3878798400 + 2742721641 = 62280^2 + 52371^2 .

It is not a de Polignac number, because 6621520041 - 2⁶ = 6621519977 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 6621519987 and 6621520014.

It is not an unprimeable number, because it can be changed into a prime (6621521041) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 40873500 + ... + 40873661.

Almost surely, 2^6621520041 is an apocalyptic number.

It is an amenable number.

6621520041 is a deficient number, since it is larger than the sum of its proper divisors (3269886561).

6621520041 is an equidigital number, since it uses as much as digits as its factorization.

6621520041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81747173 (or 81747164 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 6621520041 is about 81372.7229543168. The cubic root of 6621520041 is about 1877.8139712026.

The spelling of 6621520041 in words is "six billion, six hundred twenty-one million, five hundred twenty thousand, forty-one".