55640477 has 2 divisors, whose sum is σ = 55640478. Its totient is φ = 55640476.

The previous prime is 55640471. The next prime is 55640509. The reversal of 55640477 is 77404655.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53860921 + 1779556 = 7339^2 + 1334^2 .

It is a cyclic number.

It is not a de Polignac number, because 55640477 - 2⁶ = 55640413 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55640477.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55640471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27820238 + 27820239.

It is an arithmetic number, because the mean of its divisors is an integer number (27820239).

Almost surely, 2^55640477 is an apocalyptic number.

It is an amenable number.

55640477 is a deficient number, since it is larger than the sum of its proper divisors (1).

55640477 is an equidigital number, since it uses as much as digits as its factorization.

55640477 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 117600, while the sum is 38.

The square root of 55640477 is about 7459.2544533619. The cubic root of 55640477 is about 381.7657367790.

The spelling of 55640477 in words is "fifty-five million, six hundred forty thousand, four hundred seventy-seven".