263778157 has 2 divisors, whose sum is σ = 263778158. Its totient is φ = 263778156.

The previous prime is 263778131. The next prime is 263778161. The reversal of 263778157 is 751877362.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 249292521 + 14485636 = 15789^2 + 3806^2 .

It is a cyclic number.

It is not a de Polignac number, because 263778157 - 2¹¹ = 263776109 is a prime.

It is a super-2 number, since 2×263778157² = 139157832220633298, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (263778107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 131889078 + 131889079.

It is an arithmetic number, because the mean of its divisors is an integer number (131889079).

Almost surely, 2^263778157 is an apocalyptic number.

It is an amenable number.

263778157 is a deficient number, since it is larger than the sum of its proper divisors (1).

263778157 is an equidigital number, since it uses as much as digits as its factorization.

263778157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 493920, while the sum is 46.

The square root of 263778157 is about 16241.2486281074. The cubic root of 263778157 is about 641.3271264928.

The spelling of 263778157 in words is "two hundred sixty-three million, seven hundred seventy-eight thousand, one hundred fifty-seven".