55780477 has 2 divisors, whose sum is σ = 55780478. Its totient is φ = 55780476.

The previous prime is 55780469. The next prime is 55780481. The reversal of 55780477 is 77408755.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55442916 + 337561 = 7446^2 + 581^2 .

It is a cyclic number.

It is not a de Polignac number, because 55780477 - 2³ = 55780469 is a prime.

It is a super-2 number, since 2×55780477² = 6222923228695058, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55780877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27890238 + 27890239.

It is an arithmetic number, because the mean of its divisors is an integer number (27890239).

Almost surely, 2^55780477 is an apocalyptic number.

It is an amenable number.

55780477 is a deficient number, since it is larger than the sum of its proper divisors (1).

55780477 is an equidigital number, since it uses as much as digits as its factorization.

55780477 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 274400, while the sum is 43.

The square root of 55780477 is about 7468.6328735586. The cubic root of 55780477 is about 382.0856623767.

The spelling of 55780477 in words is "fifty-five million, seven hundred eighty thousand, four hundred seventy-seven".