55620899 has 2 divisors, whose sum is σ = 55620900. Its totient is φ = 55620898.

The previous prime is 55620871. The next prime is 55620907. The reversal of 55620899 is 99802655.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55620899 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (55626899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27810449 + 27810450.

It is an arithmetic number, because the mean of its divisors is an integer number (27810450).

Almost surely, 2^55620899 is an apocalyptic number.

55620899 is a deficient number, since it is larger than the sum of its proper divisors (1).

55620899 is an equidigital number, since it uses as much as digits as its factorization.

55620899 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 194400, while the sum is 44.

The square root of 55620899 is about 7457.9420083559. The cubic root of 55620899 is about 381.7209547138.

The spelling of 55620899 in words is "fifty-five million, six hundred twenty thousand, eight hundred ninety-nine".