1258742566 has 4 divisors (see below), whose sum is σ = 1888113852. Its totient is φ = 629371282.

The previous prime is 1258742549. The next prime is 1258742623. The reversal of 1258742566 is 6652478521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6652478521 = 13 ⋅511729117.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314685640 + ... + 314685643.

It is an arithmetic number, because the mean of its divisors is an integer number (472028463).

Almost surely, 2^1258742566 is an apocalyptic number.

1258742566 is a deficient number, since it is larger than the sum of its proper divisors (629371286).

1258742566 is an equidigital number, since it uses as much as digits as its factorization.

1258742566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 629371285.

The product of its digits is 806400, while the sum is 46.

The square root of 1258742566 is about 35478.7621824663. The cubic root of 1258742566 is about 1079.7228844341.

The spelling of 1258742566 in words is "one billion, two hundred fifty-eight million, seven hundred forty-two thousand, five hundred sixty-six".