1255566651 has 8 divisors (see below), whose sum is σ = 1674630144. Its totient is φ = 836773800.

The previous prime is 1255566643. The next prime is 1255566677. The reversal of 1255566651 is 1566655521.

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

It is not a de Polignac number, because 1255566651 - 2³ = 1255566643 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1255566691) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56575 + ... + 75576.

It is an arithmetic number, because the mean of its divisors is an integer number (209328768).

Almost surely, 2^1255566651 is an apocalyptic number.

1255566651 is a deficient number, since it is larger than the sum of its proper divisors (419063493).

1255566651 is a wasteful number, since it uses less digits than its factorization.

1255566651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135321.

The product of its digits is 270000, while the sum is 42.

The square root of 1255566651 is about 35433.9759411783. The cubic root of 1255566651 is about 1078.8140419580.

The spelling of 1255566651 in words is "one billion, two hundred fifty-five million, five hundred sixty-six thousand, six hundred fifty-one".