1980817797 has 60 divisors (see below), whose sum is σ = 3173869120. Its totient is φ = 1098626256.

The previous prime is 1980817777. The next prime is 1980817807. The reversal of 1980817797 is 7977180891.

It is not a de Polignac number, because 1980817797 - 2¹⁵ = 1980785029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1980817717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 25073604 + ... + 25073682.

Almost surely, 2^1980817797 is an apocalyptic number.

It is an amenable number.

1980817797 is a deficient number, since it is larger than the sum of its proper divisors (1193051323).

1980817797 is an frugal number, since it uses more digits than its factorization.

1980817797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228 (or 148 counting only the distinct ones).

The product of its (nonzero) digits is 1778112, while the sum is 57.

The square root of 1980817797 is about 44506.3792843228. The cubic root of 1980817797 is about 1255.8800929269.

The spelling of 1980817797 in words is "one billion, nine hundred eighty million, eight hundred seventeen thousand, seven hundred ninety-seven".