66778951234 has 8 divisors (see below), whose sum is σ = 106060687308. Its totient is φ = 31425388800.

The previous prime is 66778951223. The next prime is 66778951237. The reversal of 66778951234 is 43215987766.

It can be written as a sum of positive squares in 2 ways, for example, as 64630350625 + 2148600609 = 254225^2 + 46353^2 .

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

It is not an unprimeable number, because it can be changed into a prime (66778951237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 982043367 + ... + 982043434.

Almost surely, 2^66778951234 is an apocalyptic number.

66778951234 is a deficient number, since it is larger than the sum of its proper divisors (39281736074).

66778951234 is a wasteful number, since it uses less digits than its factorization.

66778951234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1964086820.

The product of its digits is 15240960, while the sum is 58.

The spelling of 66778951234 in words is "sixty-six billion, seven hundred seventy-eight million, nine hundred fifty-one thousand, two hundred thirty-four".