263661491139 has 16 divisors (see below), whose sum is σ = 376747798272. Its totient is φ = 163587856608.

The previous prime is 263661491117. The next prime is 263661491189. The reversal of 263661491139 is 931194166362.

It is not a de Polignac number, because 263661491139 - 2⁷ = 263661491011 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 263661491091 and 263661491100.

It is not an unprimeable number, because it can be changed into a prime (263661491189) 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, 51635029 + ... + 51640134.

It is an arithmetic number, because the mean of its divisors is an integer number (23546737392).

Almost surely, 2^263661491139 is an apocalyptic number.

263661491139 is a deficient number, since it is larger than the sum of its proper divisors (113086307133).

263661491139 is a wasteful number, since it uses less digits than its factorization.

263661491139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103275226.

The product of its digits is 1259712, while the sum is 51.

The spelling of 263661491139 in words is "two hundred sixty-three billion, six hundred sixty-one million, four hundred ninety-one thousand, one hundred thirty-nine".