1981279795370 has 32 divisors (see below), whose sum is σ = 3603349241856. Its totient is φ = 784310688000.

The previous prime is 1981279795351. The next prime is 1981279795471. The reversal of 1981279795370 is 735979721891.

It is a super-3 number, since 3×1981279795370³ (a number of 38 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1981279795370.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1435946 + ... + 2454485.

It is an arithmetic number, because the mean of its divisors is an integer number (112604663808).

Almost surely, 2^{1981279795370} is an apocalyptic number.

1981279795370 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1981279795370 is a deficient number, since it is larger than the sum of its proper divisors (1622069446486).

1981279795370 is a wasteful number, since it uses less digits than its factorization.

1981279795370 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3890966.

The product of its (nonzero) digits is 60011280, while the sum is 68.

The spelling of 1981279795370 in words is "one trillion, nine hundred eighty-one billion, two hundred seventy-nine million, seven hundred ninety-five thousand, three hundred seventy".