55666066501657 has 4 divisors (see below), whose sum is σ = 55929886722256. Its totient is φ = 55402246281060.

The previous prime is 55666066501613. The next prime is 55666066501697. The reversal of 55666066501657 is 75610566066655.

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 a de Polignac number, because none of the positive numbers 2^k-55666066501657 is a prime.

It is a super-3 number, since 3×55666066501657³ (a number of 42 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55666066501697) 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, 131910109983 + ... + 131910110404.

It is an arithmetic number, because the mean of its divisors is an integer number (13982471680564).

Almost surely, 2^{55666066501657} is an apocalyptic number.

It is an amenable number.

55666066501657 is a deficient number, since it is larger than the sum of its proper divisors (263820220599).

55666066501657 is a wasteful number, since it uses less digits than its factorization.

55666066501657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263820220598.

The product of its (nonzero) digits is 204120000, while the sum is 64.

The spelling of 55666066501657 in words is "fifty-five trillion, six hundred sixty-six billion, sixty-six million, five hundred one thousand, six hundred fifty-seven".