1980358561 has 8 divisors (see below), whose sum is σ = 2000693160. Its totient is φ = 1960073472.

The previous prime is 1980358547. The next prime is 1980358607. The reversal of 1980358561 is 1658530891.

It can be written as a sum of positive squares in 4 ways, for example, as 26718561 + 1953640000 = 5169^2 + 44200^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1980358561 - 2⁵ = 1980358529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1980358531) 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 7 ways as a sum of consecutive naturals, for example, 70875 + ... + 94783.

It is an arithmetic number, because the mean of its divisors is an integer number (250086645).

Almost surely, 2^1980358561 is an apocalyptic number.

It is an amenable number.

1980358561 is a deficient number, since it is larger than the sum of its proper divisors (20334599).

1980358561 is a wasteful number, since it uses less digits than its factorization.

1980358561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24755.

The product of its (nonzero) digits is 259200, while the sum is 46.

The square root of 1980358561 is about 44501.2197697996. The cubic root of 1980358561 is about 1255.7830303352.

The spelling of 1980358561 in words is "one billion, nine hundred eighty million, three hundred fifty-eight thousand, five hundred sixty-one".