66670892378 has 4 divisors (see below), whose sum is σ = 100006338570. Its totient is φ = 33335446188.

The previous prime is 66670892369. The next prime is 66670892399. The reversal of 66670892378 is 87329807666.

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

It can be written as a sum of positive squares in only one way, i.e., 66266600929 + 404291449 = 257423^2 + 20107^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 66670892378.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 16667723093 + ... + 16667723096.

Almost surely, 2^66670892378 is an apocalyptic number.

66670892378 is a deficient number, since it is larger than the sum of its proper divisors (33335446192).

66670892378 is a wasteful number, since it uses less digits than its factorization.

66670892378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33335446191.

The product of its (nonzero) digits is 36578304, while the sum is 62.

The spelling of 66670892378 in words is "sixty-six billion, six hundred seventy million, eight hundred ninety-two thousand, three hundred seventy-eight".