78254936066 has 8 divisors (see below), whose sum is σ = 117978254460. Its totient is φ = 38928851248.

The previous prime is 78254936051. The next prime is 78254936153. The reversal of 78254936066 is 66063945287.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 62522502025 + 15732434041 = 250045^2 + 125429^2 .

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

It is a super-3 number, since 3×78254936066³ (a number of 34 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99307901 + ... + 99308688.

Almost surely, 2^78254936066 is an apocalyptic number.

78254936066 is a deficient number, since it is larger than the sum of its proper divisors (39723318394).

78254936066 is a wasteful number, since it uses less digits than its factorization.

78254936066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198616788.

The product of its (nonzero) digits is 13063680, while the sum is 56.

The spelling of 78254936066 in words is "seventy-eight billion, two hundred fifty-four million, nine hundred thirty-six thousand, sixty-six".