71606651551 has 2 divisors, whose sum is σ = 71606651552. Its totient is φ = 71606651550.

The previous prime is 71606651537. The next prime is 71606651573. The reversal of 71606651551 is 15515660617.

It is a weak prime.

It is an emirp because it is prime and its reverse (15515660617) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71606651551 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 71606651498 and 71606651507.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71606651521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35803325775 + 35803325776.

It is an arithmetic number, because the mean of its divisors is an integer number (35803325776).

Almost surely, 2^71606651551 is an apocalyptic number.

71606651551 is a deficient number, since it is larger than the sum of its proper divisors (1).

71606651551 is an equidigital number, since it uses as much as digits as its factorization.

71606651551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 189000, while the sum is 43.

The spelling of 71606651551 in words is "seventy-one billion, six hundred six million, six hundred fifty-one thousand, five hundred fifty-one".