66758404451027 has 4 divisors (see below), whose sum is σ = 66828455243640. Its totient is φ = 66688353658416.

The previous prime is 66758404451009. The next prime is 66758404451029. The reversal of 66758404451027 is 72015440485766.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66758404451027 - 2¹⁴ = 66758404434643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66758404451029) 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, 35025394877 + ... + 35025396782.

It is an arithmetic number, because the mean of its divisors is an integer number (16707113810910).

Almost surely, 2^{66758404451027} is an apocalyptic number.

66758404451027 is a deficient number, since it is larger than the sum of its proper divisors (70050792613).

66758404451027 is an equidigital number, since it uses as much as digits as its factorization.

66758404451027 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70050792612.

The product of its (nonzero) digits is 45158400, while the sum is 59.

The spelling of 66758404451027 in words is "sixty-six trillion, seven hundred fifty-eight billion, four hundred four million, four hundred fifty-one thousand, twenty-seven".