1256650660 has 36 divisors (see below), whose sum is σ = 2679133212. Its totient is φ = 495122496.

The previous prime is 1256650657. The next prime is 1256650711. The reversal of 1256650660 is 660566521.

It can be written as a sum of positive squares in 2 ways, for example, as 531210304 + 725440356 = 23048^2 + 26934^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 82782 + ... + 96778.

It is an arithmetic number, because the mean of its divisors is an integer number (74420367).

Almost surely, 2^1256650660 is an apocalyptic number.

1256650660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1256650660 is an abundant number, since it is smaller than the sum of its proper divisors (1422482552).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1256650660 is a wasteful number, since it uses less digits than its factorization.

1256650660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14140 (or 14071 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 37.

The square root of 1256650660 is about 35449.2688217966. The cubic root of 1256650660 is about 1079.1244218012.

The spelling of 1256650660 in words is "one billion, two hundred fifty-six million, six hundred fifty thousand, six hundred sixty".