55520779 has 2 divisors, whose sum is σ = 55520780. Its totient is φ = 55520778.

The previous prime is 55520767. The next prime is 55520789. The reversal of 55520779 is 97702555.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55520779 is a prime.

It is not a weakly prime, because it can be changed into another prime (55520719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27760389 + 27760390.

It is an arithmetic number, because the mean of its divisors is an integer number (27760390).

Almost surely, 2^55520779 is an apocalyptic number.

55520779 is a deficient number, since it is larger than the sum of its proper divisors (1).

55520779 is an equidigital number, since it uses as much as digits as its factorization.

55520779 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 110250, while the sum is 40.

The square root of 55520779 is about 7451.2266775344. The cubic root of 55520779 is about 381.4917791286.

The spelling of 55520779 in words is "fifty-five million, five hundred twenty thousand, seven hundred seventy-nine".