1980947655 has 12 divisors (see below), whose sum is σ = 3433642680. Its totient is φ = 1056505392.

The previous prime is 1980947653. The next prime is 1980947659. The reversal of 1980947655 is 5567490891.

It is not a de Polignac number, because 1980947655 - 2¹ = 1980947653 is a prime.

It is a super-2 number, since 2×1980947655² = 7848307223699998050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1980947653) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 22010485 + ... + 22010574.

It is an arithmetic number, because the mean of its divisors is an integer number (286136890).

Almost surely, 2^1980947655 is an apocalyptic number.

1980947655 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1980947655 is a deficient number, since it is larger than the sum of its proper divisors (1452695025).

1980947655 is a wasteful number, since it uses less digits than its factorization.

1980947655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44021070 (or 44021067 counting only the distinct ones).

The product of its (nonzero) digits is 2721600, while the sum is 54.

The square root of 1980947655 is about 44507.8381299294. The cubic root of 1980947655 is about 1255.9075365605.

The spelling of 1980947655 in words is "one billion, nine hundred eighty million, nine hundred forty-seven thousand, six hundred fifty-five".