263990157 has 4 divisors (see below), whose sum is σ = 351986880. Its totient is φ = 175993436.

The previous prime is 263990149. The next prime is 263990171. The reversal of 263990157 is 751099362.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 263990157 - 2³ = 263990149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (263990107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43998357 + ... + 43998362.

It is an arithmetic number, because the mean of its divisors is an integer number (87996720).

Almost surely, 2^263990157 is an apocalyptic number.

It is an amenable number.

263990157 is a deficient number, since it is larger than the sum of its proper divisors (87996723).

263990157 is an equidigital number, since it uses as much as digits as its factorization.

263990157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87996722.

The product of its (nonzero) digits is 102060, while the sum is 42.

The square root of 263990157 is about 16247.7739090621. The cubic root of 263990157 is about 641.4988932333.

The spelling of 263990157 in words is "two hundred sixty-three million, nine hundred ninety thousand, one hundred fifty-seven".