66557763662851 has 8 divisors (see below), whose sum is σ = 72903027136320. Its totient is φ = 60482511401088.

The previous prime is 66557763662849. The next prime is 66557763662861. The reversal of 66557763662851 is 15826636775566.

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 66557763662851 - 2¹ = 66557763662849 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66557763662861) 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, 67502802411 + ... + 67502803396.

It is an arithmetic number, because the mean of its divisors is an integer number (9112878392040).

Almost surely, 2^{66557763662851} is an apocalyptic number.

66557763662851 is a deficient number, since it is larger than the sum of its proper divisors (6345263473469).

66557763662851 is a wasteful number, since it uses less digits than its factorization.

66557763662851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135005605853.

The product of its digits is 2286144000, while the sum is 73.

The spelling of 66557763662851 in words is "sixty-six trillion, five hundred fifty-seven billion, seven hundred sixty-three million, six hundred sixty-two thousand, eight hundred fifty-one".