39878051642 has 16 divisors (see below), whose sum is σ = 70274608992. Its totient is φ = 16732049520.

The previous prime is 39878051639. The next prime is 39878051663. The reversal of 39878051642 is 24615087893.

39878051642 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69716588 + ... + 69717159.

It is an arithmetic number, because the mean of its divisors is an integer number (4392163062).

It is a 2-persistent number, because it is pandigital, and so is 2⋅39878051642 = 79756103284, but 3⋅39878051642 = 119634154926 is not.

Almost surely, 2^39878051642 is an apocalyptic number.

39878051642 is a deficient number, since it is larger than the sum of its proper divisors (30396557350).

39878051642 is a wasteful number, since it uses less digits than its factorization.

39878051642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139433773.

The product of its (nonzero) digits is 2903040, while the sum is 53.

The spelling of 39878051642 in words is "thirty-nine billion, eight hundred seventy-eight million, fifty-one thousand, six hundred forty-two".