55166791 has 2 divisors, whose sum is σ = 55166792. Its totient is φ = 55166790.

The previous prime is 55166731. The next prime is 55166801. The reversal of 55166791 is 19766155.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55166791 - 2⁷ = 55166663 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55166731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27583395 + 27583396.

It is an arithmetic number, because the mean of its divisors is an integer number (27583396).

Almost surely, 2^55166791 is an apocalyptic number.

55166791 is a deficient number, since it is larger than the sum of its proper divisors (1).

55166791 is an equidigital number, since it uses as much as digits as its factorization.

55166791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 56700, while the sum is 40.

The square root of 55166791 is about 7427.4350215939. The cubic root of 55166791 is about 380.6792813117.

The spelling of 55166791 in words is "fifty-five million, one hundred sixty-six thousand, seven hundred ninety-one".