1580783372866 has 4 divisors (see below), whose sum is σ = 2371175059302. Its totient is φ = 790391686432.

The previous prime is 1580783372843. The next prime is 1580783372867. The reversal of 1580783372866 is 6682733870851.

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

It can be written as a sum of positive squares in only one way, i.e., 1424153437641 + 156629935225 = 1193379^2 + 395765^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1580783372798 and 1580783372807.

It is not an unprimeable number, because it can be changed into a prime (1580783372867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 395195843215 + ... + 395195843218.

Almost surely, 2^{1580783372866} is an apocalyptic number.

1580783372866 is a deficient number, since it is larger than the sum of its proper divisors (790391686436).

1580783372866 is an equidigital number, since it uses as much as digits as its factorization.

1580783372866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 790391686435.

The product of its (nonzero) digits is 81285120, while the sum is 64.

The spelling of 1580783372866 in words is "one trillion, five hundred eighty billion, seven hundred eighty-three million, three hundred seventy-two thousand, eight hundred sixty-six".