250778155 has 4 divisors (see below), whose sum is σ = 300933792. Its totient is φ = 200622520.

The previous prime is 250778149. The next prime is 250778161. The reversal of 250778155 is 551877052.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (250778149) and next prime (250778161).

It is not a de Polignac number, because 250778155 - 2⁷ = 250778027 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25077811 + ... + 25077820.

It is an arithmetic number, because the mean of its divisors is an integer number (75233448).

Almost surely, 2^250778155 is an apocalyptic number.

250778155 is a deficient number, since it is larger than the sum of its proper divisors (50155637).

250778155 is an equidigital number, since it uses as much as digits as its factorization.

250778155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50155636.

The product of its (nonzero) digits is 98000, while the sum is 40.

The square root of 250778155 is about 15835.9766039231. The cubic root of 250778155 is about 630.6134572150.

The spelling of 250778155 in words is "two hundred fifty million, seven hundred seventy-eight thousand, one hundred fifty-five".