6671635801921 has 8 divisors (see below), whose sum is σ = 6852000751424. Its totient is φ = 6491273508720.

The previous prime is 6671635801871. The next prime is 6671635801951. The reversal of 6671635801921 is 1291085361766.

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

It is not a de Polignac number, because 6671635801921 - 2³⁹ = 6121879988033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6671635801951) 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, 5092606 + ... + 6267208.

It is an arithmetic number, because the mean of its divisors is an integer number (856500093928).

Almost surely, 2^{6671635801921} is an apocalyptic number.

It is an amenable number.

6671635801921 is a deficient number, since it is larger than the sum of its proper divisors (180364949503).

6671635801921 is a wasteful number, since it uses less digits than its factorization.

6671635801921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1328151.

The product of its (nonzero) digits is 3265920, while the sum is 55.

The spelling of 6671635801921 in words is "six trillion, six hundred seventy-one billion, six hundred thirty-five million, eight hundred one thousand, nine hundred twenty-one".