55778543 has 2 divisors, whose sum is σ = 55778544. Its totient is φ = 55778542.

The previous prime is 55778539. The next prime is 55778549. The reversal of 55778543 is 34587755.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55778543 - 2² = 55778539 is a prime.

It is a super-2 number, since 2×55778543² = 6222491718405698, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 55778494 and 55778503.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55778549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27889271 + 27889272.

It is an arithmetic number, because the mean of its divisors is an integer number (27889272).

Almost surely, 2^55778543 is an apocalyptic number.

55778543 is a deficient number, since it is larger than the sum of its proper divisors (1).

55778543 is an equidigital number, since it uses as much as digits as its factorization.

55778543 is an evil number, because the sum of its binary digits is even.

The product of its digits is 588000, while the sum is 44.

The square root of 55778543 is about 7468.5033976025. The cubic root of 55778543 is about 382.0812464816.

The spelling of 55778543 in words is "fifty-five million, seven hundred seventy-eight thousand, five hundred forty-three".