8966989621 has 4 divisors (see below), whose sum is σ = 8968509472. Its totient is φ = 8965469772.

The previous prime is 8966989589. The next prime is 8966989651. The reversal of 8966989621 is 1269896698.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 8966989621 - 2⁵ = 8966989589 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 (8966989651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 751041 + ... + 762886.

It is an arithmetic number, because the mean of its divisors is an integer number (2242127368).

Almost surely, 2^8966989621 is an apocalyptic number.

It is an amenable number.

8966989621 is a deficient number, since it is larger than the sum of its proper divisors (1519851).

8966989621 is a wasteful number, since it uses less digits than its factorization.

8966989621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1519850.

The product of its digits is 20155392, while the sum is 64.

The square root of 8966989621 is about 94694.1900065680. The cubic root of 8966989621 is about 2077.5375831879.

The spelling of 8966989621 in words is "eight billion, nine hundred sixty-six million, nine hundred eighty-nine thousand, six hundred twenty-one".