1980624665 has 8 divisors (see below), whose sum is σ = 2379249288. Its totient is φ = 1582833280.

The previous prime is 1980624643. The next prime is 1980624671. The reversal of 1980624665 is 5664260891.

It can be written as a sum of positive squares in 4 ways, for example, as 2421136 + 1978203529 = 1556^2 + 44477^2 .

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

It is not a de Polignac number, because 1980624665 - 2⁸ = 1980624409 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 203066 + ... + 212595.

It is an arithmetic number, because the mean of its divisors is an integer number (297406161).

Almost surely, 2^1980624665 is an apocalyptic number.

It is an amenable number.

1980624665 is a deficient number, since it is larger than the sum of its proper divisors (398624623).

1980624665 is an equidigital number, since it uses as much as digits as its factorization.

1980624665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 416619.

The product of its (nonzero) digits is 622080, while the sum is 47.

The square root of 1980624665 is about 44504.2095199993. The cubic root of 1980624665 is about 1255.8392750186.

The spelling of 1980624665 in words is "one billion, nine hundred eighty million, six hundred twenty-four thousand, six hundred sixty-five".