66839061378 has 32 divisors (see below), whose sum is σ = 135002649600. Its totient is φ = 22059018576.

The previous prime is 66839061353. The next prime is 66839061379. The reversal of 66839061378 is 87316093866.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66839061379) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5072763 + ... + 5085921.

It is an arithmetic number, because the mean of its divisors is an integer number (4218832800).

Almost surely, 2^66839061378 is an apocalyptic number.

66839061378 is an abundant number, since it is smaller than the sum of its proper divisors (68163588222).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66839061378 is a wasteful number, since it uses less digits than its factorization.

66839061378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21486.

The product of its (nonzero) digits is 7838208, while the sum is 57.

The spelling of 66839061378 in words is "sixty-six billion, eight hundred thirty-nine million, sixty-one thousand, three hundred seventy-eight".