20661654362611 has 8 divisors (see below), whose sum is σ = 21750762409920. Its totient is φ = 19572711570792.

The previous prime is 20661654362603. The next prime is 20661654362641. The reversal of 20661654362611 is 11626345616602.

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 20661654362611 - 2³ = 20661654362603 is a prime.

It is a super-2 number, since 2×20661654362611² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20661654362641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41057185 + ... + 41557378.

It is an arithmetic number, because the mean of its divisors is an integer number (2718845301240).

Almost surely, 2^{20661654362611} is an apocalyptic number.

20661654362611 is a deficient number, since it is larger than the sum of its proper divisors (1089108047309).

20661654362611 is a wasteful number, since it uses less digits than its factorization.

20661654362611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82627745.

The product of its (nonzero) digits is 1866240, while the sum is 49.

The spelling of 20661654362611 in words is "twenty trillion, six hundred sixty-one billion, six hundred fifty-four million, three hundred sixty-two thousand, six hundred eleven".