1980637550 has 12 divisors (see below), whose sum is σ = 3683985936. Its totient is φ = 792255000.

The previous prime is 1980637541. The next prime is 1980637559. The reversal of 1980637550 is 557360891.

It is an interprime number because it is at equal distance from previous prime (1980637541) and next prime (1980637559).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1980637559) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 19806326 + ... + 19806425.

It is an arithmetic number, because the mean of its divisors is an integer number (306998828).

Almost surely, 2^1980637550 is an apocalyptic number.

1980637550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1980637550 is a deficient number, since it is larger than the sum of its proper divisors (1703348386).

1980637550 is a wasteful number, since it uses less digits than its factorization.

1980637550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39612763 (or 39612758 counting only the distinct ones).

The product of its (nonzero) digits is 226800, while the sum is 44.

The square root of 1980637550 is about 44504.3542813509. The cubic root of 1980637550 is about 1255.8419983099.

The spelling of 1980637550 in words is "one billion, nine hundred eighty million, six hundred thirty-seven thousand, five hundred fifty".