1255620651 has 8 divisors (see below), whose sum is σ = 1709781504. Its totient is φ = 819270120.

The previous prime is 1255620601. The next prime is 1255620661. The reversal of 1255620651 is 1560265521.

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

It is not a de Polignac number, because 1255620651 - 2¹⁰ = 1255619627 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1255620601) 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, 4452415 + ... + 4452696.

It is an arithmetic number, because the mean of its divisors is an integer number (213722688).

Almost surely, 2^1255620651 is an apocalyptic number.

1255620651 is a deficient number, since it is larger than the sum of its proper divisors (454160853).

1255620651 is an equidigital number, since it uses as much as digits as its factorization.

1255620651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8905161.

The product of its (nonzero) digits is 18000, while the sum is 33.

The square root of 1255620651 is about 35434.7379135221. The cubic root of 1255620651 is about 1078.8295077832.

The spelling of 1255620651 in words is "one billion, two hundred fifty-five million, six hundred twenty thousand, six hundred fifty-one".