1985670557738 has 16 divisors (see below), whose sum is σ = 3461701700160. Its totient is φ = 836577910176.

The previous prime is 1985670557723. The next prime is 1985670557743. The reversal of 1985670557738 is 8377550765891.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1201978931 + ... + 1201980582.

It is an arithmetic number, because the mean of its divisors is an integer number (216356356260).

Almost surely, 2^{1985670557738} is an apocalyptic number.

1985670557738 is a deficient number, since it is larger than the sum of its proper divisors (1476031142422).

1985670557738 is a wasteful number, since it uses less digits than its factorization.

1985670557738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2403959581.

The product of its (nonzero) digits is 444528000, while the sum is 71.

The spelling of 1985670557738 in words is "one trillion, nine hundred eighty-five billion, six hundred seventy million, five hundred fifty-seven thousand, seven hundred thirty-eight".