1263799155 has 16 divisors (see below), whose sum is σ = 2128504320. Its totient is φ = 638551008.

The previous prime is 1263799153. The next prime is 1263799169. The reversal of 1263799155 is 5519973621.

It is not a de Polignac number, because 1263799155 - 2¹ = 1263799153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1263799153) 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, 2216907 + ... + 2217476.

It is an arithmetic number, because the mean of its divisors is an integer number (133031520).

Almost surely, 2^1263799155 is an apocalyptic number.

1263799155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1263799155 is a deficient number, since it is larger than the sum of its proper divisors (864705165).

1263799155 is a wasteful number, since it uses less digits than its factorization.

1263799155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4434410.

The product of its digits is 510300, while the sum is 48.

The square root of 1263799155 is about 35549.9529535554. The cubic root of 1263799155 is about 1081.1667645951.

The spelling of 1263799155 in words is "one billion, two hundred sixty-three million, seven hundred ninety-nine thousand, one hundred fifty-five".