1982657645 has 8 divisors (see below), whose sum is σ = 2461230360. Its totient is φ = 1531432000.

The previous prime is 1982657641. The next prime is 1982657671. The reversal of 1982657645 is 5467562891.

It can be written as a sum of positive squares in 4 ways, for example, as 505485289 + 1477172356 = 22483^2 + 38434^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1982657645 - 2² = 1982657641 is a prime.

It is a super-3 number, since 3×1982657645³ (a number of 29 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1982657641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6836606 + ... + 6836895.

It is an arithmetic number, because the mean of its divisors is an integer number (307653795).

Almost surely, 2^1982657645 is an apocalyptic number.

It is an amenable number.

1982657645 is a deficient number, since it is larger than the sum of its proper divisors (478572715).

1982657645 is a wasteful number, since it uses less digits than its factorization.

1982657645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13673535.

The product of its digits is 3628800, while the sum is 53.

The square root of 1982657645 is about 44527.0439732978. The cubic root of 1982657645 is about 1256.2688066952.

The spelling of 1982657645 in words is "one billion, nine hundred eighty-two million, six hundred fifty-seven thousand, six hundred forty-five".