250778983993 has 4 divisors (see below), whose sum is σ = 251112911488. Its totient is φ = 250445056500.

The previous prime is 250778983991. The next prime is 250778984009. The reversal of 250778983993 is 399389877052.

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 250778983993 - 2¹ = 250778983991 is a prime.

It is a super-2 number, since 2×250778983993² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (250778983991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 166962621 + ... + 166964122.

It is an arithmetic number, because the mean of its divisors is an integer number (62778227872).

Almost surely, 2^250778983993 is an apocalyptic number.

It is an amenable number.

250778983993 is a deficient number, since it is larger than the sum of its proper divisors (333927495).

250778983993 is an equidigital number, since it uses as much as digits as its factorization.

250778983993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333927494.

The product of its (nonzero) digits is 205752960, while the sum is 70.

The spelling of 250778983993 in words is "two hundred fifty billion, seven hundred seventy-eight million, nine hundred eighty-three thousand, nine hundred ninety-three".