6608621054661 has 4 divisors (see below), whose sum is σ = 8811494739552. Its totient is φ = 4405747369772.

The previous prime is 6608621054657. The next prime is 6608621054671. The reversal of 6608621054661 is 1664501268066.

It is a happy number.

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 6608621054661 - 2² = 6608621054657 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6608621054671) 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, 1101436842441 + ... + 1101436842446.

It is an arithmetic number, because the mean of its divisors is an integer number (2202873684888).

Almost surely, 2^{6608621054661} is an apocalyptic number.

It is an amenable number.

6608621054661 is a deficient number, since it is larger than the sum of its proper divisors (2202873684891).

6608621054661 is a wasteful number, since it uses less digits than its factorization.

6608621054661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2202873684890.

The product of its (nonzero) digits is 2488320, while the sum is 51.

The spelling of 6608621054661 in words is "six trillion, six hundred eight billion, six hundred twenty-one million, fifty-four thousand, six hundred sixty-one".