55016399 has 2 divisors, whose sum is σ = 55016400. Its totient is φ = 55016398.

The previous prime is 55016371. The next prime is 55016407. The reversal of 55016399 is 99361055.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55016399 is a prime.

It is a Sophie Germain prime.

It is a plaindrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55016359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27508199 + 27508200.

It is an arithmetic number, because the mean of its divisors is an integer number (27508200).

Almost surely, 2^55016399 is an apocalyptic number.

55016399 is a deficient number, since it is larger than the sum of its proper divisors (1).

55016399 is an equidigital number, since it uses as much as digits as its factorization.

55016399 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36450, while the sum is 38.

The square root of 55016399 is about 7417.3040250485. The cubic root of 55016399 is about 380.3330390580. Note that the first 3 decimals are identical.

The spelling of 55016399 in words is "fifty-five million, sixteen thousand, three hundred ninety-nine".