1255133661 has 8 divisors (see below), whose sum is σ = 1674777984. Its totient is φ = 836122560.

The previous prime is 1255133641. The next prime is 1255133687. The reversal of 1255133661 is 1663315521.

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

It is not a de Polignac number, because 1255133661 - 2¹⁷ = 1255002589 is a prime.

It is a super-3 number, since 3×1255133661³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1255133641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 153660 + ... + 161621.

It is an arithmetic number, because the mean of its divisors is an integer number (209347248).

Almost surely, 2^1255133661 is an apocalyptic number.

It is an amenable number.

1255133661 is a deficient number, since it is larger than the sum of its proper divisors (419644323).

1255133661 is a wasteful number, since it uses less digits than its factorization.

1255133661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316611.

The product of its digits is 16200, while the sum is 33.

The square root of 1255133661 is about 35427.8656003999. The cubic root of 1255133661 is about 1078.6900157802.

The spelling of 1255133661 in words is "one billion, two hundred fifty-five million, one hundred thirty-three thousand, six hundred sixty-one".