71550679477 has 2 divisors, whose sum is σ = 71550679478. Its totient is φ = 71550679476.

The previous prime is 71550679451. The next prime is 71550679493. The reversal of 71550679477 is 77497605517.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68665485681 + 2885193796 = 262041^2 + 53714^2 .

It is a cyclic number.

It is not a de Polignac number, because 71550679477 - 2¹⁹ = 71550155189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71550679777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35775339738 + 35775339739.

It is an arithmetic number, because the mean of its divisors is an integer number (35775339739).

Almost surely, 2^71550679477 is an apocalyptic number.

It is an amenable number.

71550679477 is a deficient number, since it is larger than the sum of its proper divisors (1).

71550679477 is an equidigital number, since it uses as much as digits as its factorization.

71550679477 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12965400, while the sum is 58.

The spelling of 71550679477 in words is "seventy-one billion, five hundred fifty million, six hundred seventy-nine thousand, four hundred seventy-seven".