6650011611661 has 8 divisors (see below), whose sum is σ = 7254581400864. Its totient is φ = 6045445702320.

The previous prime is 6650011611643. The next prime is 6650011611671. The reversal of 6650011611661 is 1661161100566.

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 6650011611661 - 2⁷ = 6650011611533 is a prime.

It is a super-2 number, since 2×6650011611661² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6650011611611) 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, 3515811 + ... + 5065663.

It is an arithmetic number, because the mean of its divisors is an integer number (906822675108).

Almost surely, 2^{6650011611661} is an apocalyptic number.

It is an amenable number.

6650011611661 is a deficient number, since it is larger than the sum of its proper divisors (604569789203).

6650011611661 is a wasteful number, since it uses less digits than its factorization.

6650011611661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1939931.

The product of its (nonzero) digits is 38880, while the sum is 40.

The spelling of 6650011611661 in words is "six trillion, six hundred fifty billion, eleven million, six hundred eleven thousand, six hundred sixty-one".