71172220051 has 2 divisors, whose sum is σ = 71172220052. Its totient is φ = 71172220050.

The previous prime is 71172220039. The next prime is 71172220069. The reversal of 71172220051 is 15002227117.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71172220051 is a prime.

It is not a weakly prime, because it can be changed into another prime (71172220751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35586110025 + 35586110026.

It is an arithmetic number, because the mean of its divisors is an integer number (35586110026).

Almost surely, 2^71172220051 is an apocalyptic number.

71172220051 is a deficient number, since it is larger than the sum of its proper divisors (1).

71172220051 is an equidigital number, since it uses as much as digits as its factorization.

71172220051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1960, while the sum is 28.

Adding to 71172220051 its reverse (15002227117), we get a palindrome (86174447168).

The spelling of 71172220051 in words is "seventy-one billion, one hundred seventy-two million, two hundred twenty thousand, fifty-one".