66556574415377 has 8 divisors (see below), whose sum is σ = 67354280452800. Its totient is φ = 65762270110224.

The previous prime is 66556574415329. The next prime is 66556574415379. The reversal of 66556574415377 is 77351447565566.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66556574415377 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66556574415377.

It is not an unprimeable number, because it can be changed into a prime (66556574415379) 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, 850393703 + ... + 850471964.

It is an arithmetic number, because the mean of its divisors is an integer number (8419285056600).

Almost surely, 2^{66556574415377} is an apocalyptic number.

It is an amenable number.

66556574415377 is a deficient number, since it is larger than the sum of its proper divisors (797706037423).

66556574415377 is a wasteful number, since it uses less digits than its factorization.

66556574415377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1700866135.

The product of its digits is 2222640000, while the sum is 71.

The spelling of 66556574415377 in words is "sixty-six trillion, five hundred fifty-six billion, five hundred seventy-four million, four hundred fifteen thousand, three hundred seventy-seven".