51613610071 has 4 divisors (see below), whose sum is σ = 51779570544. Its totient is φ = 51447649600.

The previous prime is 51613610057. The next prime is 51613610077. The reversal of 51613610071 is 17001631615.

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

It is a cyclic number.

It is not a de Polignac number, because 51613610071 - 2²¹ = 51611512919 is a prime.

It is a super-2 number, since 2×51613610071² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51613610077) 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, 82979770 + ... + 82980391.

It is an arithmetic number, because the mean of its divisors is an integer number (12944892636).

Almost surely, 2^51613610071 is an apocalyptic number.

51613610071 is a deficient number, since it is larger than the sum of its proper divisors (165960473).

51613610071 is a wasteful number, since it uses less digits than its factorization.

51613610071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165960472.

The product of its (nonzero) digits is 3780, while the sum is 31.

The spelling of 51613610071 in words is "fifty-one billion, six hundred thirteen million, six hundred ten thousand, seventy-one".