253861692394 has 4 divisors (see below), whose sum is σ = 380792538594. Its totient is φ = 126930846196.

The previous prime is 253861692373. The next prime is 253861692397. The reversal of 253861692394 is 493296168352.

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

It can be written as a sum of positive squares in only one way, i.e., 209018124225 + 44843568169 = 457185^2 + 211763^2 .

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (253861692397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63465423097 + ... + 63465423100.

Almost surely, 2^253861692394 is an apocalyptic number.

253861692394 is a deficient number, since it is larger than the sum of its proper divisors (126930846200).

253861692394 is a wasteful number, since it uses less digits than its factorization.

253861692394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126930846199.

The product of its digits is 16796160, while the sum is 58.

The spelling of 253861692394 in words is "two hundred fifty-three billion, eight hundred sixty-one million, six hundred ninety-two thousand, three hundred ninety-four".