6621500401 has 8 divisors (see below), whose sum is σ = 6687112320. Its totient is φ = 6556197888.

The previous prime is 6621500363. The next prime is 6621500411. The reversal of 6621500401 is 1040051266.

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

It is a cyclic number.

It is not a de Polignac number, because 6621500401 - 2⁹ = 6621499889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6621500411) 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, 34221 + ... + 120058.

It is an arithmetic number, because the mean of its divisors is an integer number (835889040).

Almost surely, 2^6621500401 is an apocalyptic number.

It is an amenable number.

6621500401 is a deficient number, since it is larger than the sum of its proper divisors (65611919).

6621500401 is a wasteful number, since it uses less digits than its factorization.

6621500401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154703.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 6621500401 is about 81372.6022749672. The cubic root of 6621500401 is about 1877.8121146146.

Adding to 6621500401 its reverse (1040051266), we get a palindrome (7661551667).

The spelling of 6621500401 in words is "six billion, six hundred twenty-one million, five hundred thousand, four hundred one".