1980825551 has 4 divisors (see below), whose sum is σ = 2018199672. Its totient is φ = 1943451432.

The previous prime is 1980825529. The next prime is 1980825617. The reversal of 1980825551 is 1555280891.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1980825551 - 2²⁶ = 1913716687 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 (1980825751) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18686981 + ... + 18687086.

It is an arithmetic number, because the mean of its divisors is an integer number (504549918).

Almost surely, 2^1980825551 is an apocalyptic number.

1980825551 is a deficient number, since it is larger than the sum of its proper divisors (37374121).

1980825551 is an equidigital number, since it uses as much as digits as its factorization.

1980825551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37374120.

The product of its (nonzero) digits is 144000, while the sum is 44.

The square root of 1980825551 is about 44506.4663953453. The cubic root of 1980825551 is about 1255.8817316577.

The spelling of 1980825551 in words is "one billion, nine hundred eighty million, eight hundred twenty-five thousand, five hundred fifty-one".