1979772817936 has 45 divisors (see below), whose sum is σ = 3910138290471. Its totient is φ = 971062974336.

The previous prime is 1979772817861. The next prime is 1979772817937. The reversal of 1979772817936 is 6397182779791.

The square root of 1979772817936 is 1407044.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 351596817936 + 1628176000000 = 592956^2 + 1276000^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1979772817937) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 298290010 + ... + 298296646.

Almost surely, 2^{1979772817936} is an apocalyptic number.

1979772817936 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

1979772817936 is the 1407044-th square number.

It is an amenable number.

1979772817936 is a deficient number, since it is larger than the sum of its proper divisors (1930365472535).

1979772817936 is an frugal number, since it uses more digits than its factorization.

1979772817936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13388 (or 6692 counting only the distinct ones).

The product of its digits is 504094752, while the sum is 76.

The spelling of 1979772817936 in words is "one trillion, nine hundred seventy-nine billion, seven hundred seventy-two million, eight hundred seventeen thousand, nine hundred thirty-six".