253421640671 has 4 divisors (see below), whose sum is σ = 255356157144. Its totient is φ = 251487124200.

The previous prime is 253421640643. The next prime is 253421640679. The reversal of 253421640671 is 176046124352.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-253421640671 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (253421640679) 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, 967258040 + ... + 967258301.

It is an arithmetic number, because the mean of its divisors is an integer number (63839039286).

Almost surely, 2^253421640671 is an apocalyptic number.

253421640671 is a deficient number, since it is larger than the sum of its proper divisors (1934516473).

253421640671 is a wasteful number, since it uses less digits than its factorization.

253421640671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1934516472.

The product of its (nonzero) digits is 241920, while the sum is 41.

The spelling of 253421640671 in words is "two hundred fifty-three billion, four hundred twenty-one million, six hundred forty thousand, six hundred seventy-one".