6651236542621 has 8 divisors (see below), whose sum is σ = 7330697446464. Its totient is φ = 5984242811520.

The previous prime is 6651236542609. The next prime is 6651236542679. The reversal of 6651236542621 is 1262456321566.

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 6651236542621 - 2⁷ = 6651236542493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6651236542421) 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, 3116792065 + ... + 3116794198.

It is an arithmetic number, because the mean of its divisors is an integer number (916337180808).

Almost surely, 2^{6651236542621} is an apocalyptic number.

It is an amenable number.

6651236542621 is a deficient number, since it is larger than the sum of its proper divisors (679460903843).

6651236542621 is a wasteful number, since it uses less digits than its factorization.

6651236542621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6233586371.

The product of its digits is 3110400, while the sum is 49.

The spelling of 6651236542621 in words is "six trillion, six hundred fifty-one billion, two hundred thirty-six million, five hundred forty-two thousand, six hundred twenty-one".