66801205141478 has 4 divisors (see below), whose sum is σ = 100201807712220. Its totient is φ = 33400602570738.

The previous prime is 66801205141471. The next prime is 66801205141513. The reversal of 66801205141478 is 87414150210866.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66801205141471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16700301285368 + ... + 16700301285371.

It is an arithmetic number, because the mean of its divisors is an integer number (25050451928055).

Almost surely, 2^{66801205141478} is an apocalyptic number.

66801205141478 is a deficient number, since it is larger than the sum of its proper divisors (33400602570742).

66801205141478 is a wasteful number, since it uses less digits than its factorization.

66801205141478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33400602570741.

The product of its (nonzero) digits is 2580480, while the sum is 53.

The spelling of 66801205141478 in words is "sixty-six trillion, eight hundred one billion, two hundred five million, one hundred forty-one thousand, four hundred seventy-eight".