53666666661 has 8 divisors (see below), whose sum is σ = 71634451744. Its totient is φ = 35738329680.

The previous prime is 53666666639. The next prime is 53666666663. The reversal of 53666666661 is 16666666635.

53666666661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 53666666661 - 2²¹ = 53664569509 is a prime.

It is a super-2 number, since 2×53666666661² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53666666663) 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, 9858850 + ... + 9864291.

It is an arithmetic number, because the mean of its divisors is an integer number (8954306468).

Almost surely, 2^53666666661 is an apocalyptic number.

It is an amenable number.

53666666661 is a deficient number, since it is larger than the sum of its proper divisors (17967785083).

53666666661 is a wasteful number, since it uses less digits than its factorization.

53666666661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19724051.

The product of its digits is 25194240, while the sum is 57.

The spelling of 53666666661 in words is "fifty-three billion, six hundred sixty-six million, six hundred sixty-six thousand, six hundred sixty-one".