1265140553 has 8 divisors (see below), whose sum is σ = 1324454208. Its totient is φ = 1206185904.

The previous prime is 1265140543. The next prime is 1265140571. The reversal of 1265140553 is 3550415621.

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

It is a cyclic number.

It is not a de Polignac number, because 1265140553 - 2⁶ = 1265140489 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1265140543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82526 + ... + 96647.

It is an arithmetic number, because the mean of its divisors is an integer number (165556776).

Almost surely, 2^1265140553 is an apocalyptic number.

It is an amenable number.

1265140553 is a deficient number, since it is larger than the sum of its proper divisors (59313655).

1265140553 is a wasteful number, since it uses less digits than its factorization.

1265140553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179503.

The product of its (nonzero) digits is 18000, while the sum is 32.

The square root of 1265140553 is about 35568.8143322209. The cubic root of 1265140553 is about 1081.5491465911.

The spelling of 1265140553 in words is "one billion, two hundred sixty-five million, one hundred forty thousand, five hundred fifty-three".