55145507 has 2 divisors, whose sum is σ = 55145508. Its totient is φ = 55145506.

The previous prime is 55145491. The next prime is 55145509. The reversal of 55145507 is 70554155.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55145507 - 2⁴ = 55145491 is a prime.

Together with 55145509, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (55145509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27572753 + 27572754.

It is an arithmetic number, because the mean of its divisors is an integer number (27572754).

Almost surely, 2^55145507 is an apocalyptic number.

55145507 is a deficient number, since it is larger than the sum of its proper divisors (1).

55145507 is an equidigital number, since it uses as much as digits as its factorization.

55145507 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17500, while the sum is 32.

The square root of 55145507 is about 7426.0020872607. The cubic root of 55145507 is about 380.6303181589.

The spelling of 55145507 in words is "fifty-five million, one hundred forty-five thousand, five hundred seven".