1263375553 has 16 divisors (see below), whose sum is σ = 1470818304. Its totient is φ = 1072431360.

The previous prime is 1263375539. The next prime is 1263375601. The reversal of 1263375553 is 3555733621.

It is a happy number.

It is not a de Polignac number, because 1263375553 - 2²¹ = 1261278401 is a prime.

It is a super-2 number, since 2×1263375553² = 3192235575836111618, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1263376553) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2850 + ... + 50347.

It is an arithmetic number, because the mean of its divisors is an integer number (91926144).

Almost surely, 2^1263375553 is an apocalyptic number.

It is an amenable number.

1263375553 is a deficient number, since it is larger than the sum of its proper divisors (207442751).

1263375553 is a wasteful number, since it uses less digits than its factorization.

1263375553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53352.

The product of its digits is 283500, while the sum is 40.

The square root of 1263375553 is about 35543.9946123111. The cubic root of 1263375553 is about 1081.0459554247.

The spelling of 1263375553 in words is "one billion, two hundred sixty-three million, three hundred seventy-five thousand, five hundred fifty-three".