1256620012 has 24 divisors (see below), whose sum is σ = 2258343360. Its totient is φ = 611527680.

The previous prime is 1256619997. The next prime is 1256620021. The reversal of 1256620012 is 2100266521.

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, 15564 + ... + 52492.

It is an arithmetic number, because the mean of its divisors is an integer number (94097640).

Almost surely, 2^1256620012 is an apocalyptic number.

It is an amenable number.

1256620012 is a deficient number, since it is larger than the sum of its proper divisors (1001723348).

1256620012 is a wasteful number, since it uses less digits than its factorization.

1256620012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37161 (or 37159 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 1256620012 is about 35448.8365394409. The cubic root of 1256620012 is about 1079.1156489377.

Adding to 1256620012 its reverse (2100266521), we get a palindrome (3356886533).

The spelling of 1256620012 in words is "one billion, two hundred fifty-six million, six hundred twenty thousand, twelve".