66625702378 has 16 divisors (see below), whose sum is σ = 100263499776. Its totient is φ = 33204638160.

The previous prime is 66625702373. The next prime is 66625702393. The reversal of 66625702378 is 87320752666.

It is not an unprimeable number, because it can be changed into a prime (66625702373) 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 7 ways as a sum of consecutive naturals, for example, 1335463 + ... + 1384453.

It is an arithmetic number, because the mean of its divisors is an integer number (6266468736).

Almost surely, 2^66625702378 is an apocalyptic number.

66625702378 is a deficient number, since it is larger than the sum of its proper divisors (33637797398).

66625702378 is a wasteful number, since it uses less digits than its factorization.

66625702378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51189.

The product of its (nonzero) digits is 5080320, while the sum is 52.

The spelling of 66625702378 in words is "sixty-six billion, six hundred twenty-five million, seven hundred two thousand, three hundred seventy-eight".