2139666304078 has 4 divisors (see below), whose sum is σ = 3209499456120. Its totient is φ = 1069833152038.

The previous prime is 2139666304031. The next prime is 2139666304081. The reversal of 2139666304078 is 8704036669312.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 534916576018 + ... + 534916576021.

It is an arithmetic number, because the mean of its divisors is an integer number (802374864030).

Almost surely, 2^{2139666304078} is an apocalyptic number.

2139666304078 is a deficient number, since it is larger than the sum of its proper divisors (1069833152042).

2139666304078 is a wasteful number, since it uses less digits than its factorization.

2139666304078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1069833152041.

The product of its (nonzero) digits is 7838208, while the sum is 55.

The spelling of 2139666304078 in words is "two trillion, one hundred thirty-nine billion, six hundred sixty-six million, three hundred four thousand, seventy-eight".