55978696729 has 2 divisors, whose sum is σ = 55978696730. Its totient is φ = 55978696728.

The previous prime is 55978696649. The next prime is 55978696771. The reversal of 55978696729 is 92769687955.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48646713600 + 7331983129 = 220560^2 + 85627^2 .

It is a cyclic number.

It is not a de Polignac number, because 55978696729 - 2⁷ = 55978696601 is a prime.

It is a super-2 number, since 2×55978696729² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (55978696129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27989348364 + 27989348365.

It is an arithmetic number, because the mean of its divisors is an integer number (27989348365).

Almost surely, 2^55978696729 is an apocalyptic number.

It is an amenable number.

55978696729 is a deficient number, since it is larger than the sum of its proper divisors (1).

55978696729 is an equidigital number, since it uses as much as digits as its factorization.

55978696729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 514382400, while the sum is 73.

The spelling of 55978696729 in words is "fifty-five billion, nine hundred seventy-eight million, six hundred ninety-six thousand, seven hundred twenty-nine".