55666501505071 has 2 divisors, whose sum is σ = 55666501505072. Its totient is φ = 55666501505070.

The previous prime is 55666501505063. The next prime is 55666501505101. The reversal of 55666501505071 is 17050510566655.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55666501505071 - 2³ = 55666501505063 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55666501505371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27833250752535 + 27833250752536.

It is an arithmetic number, because the mean of its divisors is an integer number (27833250752536).

Almost surely, 2^{55666501505071} is an apocalyptic number.

55666501505071 is a deficient number, since it is larger than the sum of its proper divisors (1).

55666501505071 is an equidigital number, since it uses as much as digits as its factorization.

55666501505071 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4725000, while the sum is 52.

The spelling of 55666501505071 in words is "fifty-five trillion, six hundred sixty-six billion, five hundred one million, five hundred five thousand, seventy-one".