71206651553 has 2 divisors, whose sum is σ = 71206651554. Its totient is φ = 71206651552.

The previous prime is 71206651459. The next prime is 71206651561. The reversal of 71206651553 is 35515660217.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71199849889 + 6801664 = 266833^2 + 2608^2 .

It is a cyclic number.

It is not a de Polignac number, because 71206651553 - 2⁸ = 71206651297 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 71206651553.

It is not a weakly prime, because it can be changed into another prime (71206651573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35603325776 + 35603325777.

It is an arithmetic number, because the mean of its divisors is an integer number (35603325777).

Almost surely, 2^71206651553 is an apocalyptic number.

It is an amenable number.

71206651553 is a deficient number, since it is larger than the sum of its proper divisors (1).

71206651553 is an equidigital number, since it uses as much as digits as its factorization.

71206651553 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 41.

The spelling of 71206651553 in words is "seventy-one billion, two hundred six million, six hundred fifty-one thousand, five hundred fifty-three".