1981939250770 has 32 divisors (see below), whose sum is σ = 3816284755248. Its totient is φ = 738449645568.

The previous prime is 1981939250723. The next prime is 1981939250801. The reversal of 1981939250770 is 770529391891.

It can be written as a sum of positive squares in 8 ways, for example, as 1017255805281 + 964683445489 = 1008591^2 + 982183^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1981939250699 and 1981939250708.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60078697 + ... + 60111676.

Almost surely, 2^{1981939250770} is an apocalyptic number.

1981939250770 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1981939250770 is a deficient number, since it is larger than the sum of its proper divisors (1834345504478).

1981939250770 is a wasteful number, since it uses less digits than its factorization.

1981939250770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120190494.

The product of its (nonzero) digits is 8573040, while the sum is 61.

The spelling of 1981939250770 in words is "one trillion, nine hundred eighty-one billion, nine hundred thirty-nine million, two hundred fifty thousand, seven hundred seventy".