66355783553 has 8 divisors (see below), whose sum is σ = 66435415200. Its totient is φ = 66276201888.

The previous prime is 66355783547. The next prime is 66355783561. The reversal of 66355783553 is 35538755366.

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 66355783553 - 2⁸ = 66355783297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66355783583) 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, 3087278 + ... + 3108696.

It is an arithmetic number, because the mean of its divisors is an integer number (8304426900).

Almost surely, 2^66355783553 is an apocalyptic number.

It is an amenable number.

66355783553 is a deficient number, since it is larger than the sum of its proper divisors (79631647).

66355783553 is a wasteful number, since it uses less digits than its factorization.

66355783553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24991.

The product of its digits is 34020000, while the sum is 56.

The spelling of 66355783553 in words is "sixty-six billion, three hundred fifty-five million, seven hundred eighty-three thousand, five hundred fifty-three".