613913621971 has 4 divisors (see below), whose sum is σ = 661137746752. Its totient is φ = 566689497192.

The previous prime is 613913621953. The next prime is 613913622013. The reversal of 613913621971 is 179126319316.

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

It is not a de Polignac number, because 613913621971 - 2¹³ = 613913613779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (613913621171) 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, 23612062371 + ... + 23612062396.

It is an arithmetic number, because the mean of its divisors is an integer number (165284436688).

Almost surely, 2^613913621971 is an apocalyptic number.

613913621971 is a deficient number, since it is larger than the sum of its proper divisors (47224124781).

613913621971 is a wasteful number, since it uses less digits than its factorization.

613913621971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47224124780.

The product of its digits is 367416, while the sum is 49.

The spelling of 613913621971 in words is "six hundred thirteen billion, nine hundred thirteen million, six hundred twenty-one thousand, nine hundred seventy-one".