55581602897 has 2 divisors, whose sum is σ = 55581602898. Its totient is φ = 55581602896.

The previous prime is 55581602893. The next prime is 55581602957. The reversal of 55581602897 is 79820618555.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50535489601 + 5046113296 = 224801^2 + 71036^2 .

It is a cyclic number.

It is not a de Polignac number, because 55581602897 - 2² = 55581602893 is a prime.

It is not a weakly prime, because it can be changed into another prime (55581602893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27790801448 + 27790801449.

It is an arithmetic number, because the mean of its divisors is an integer number (27790801449).

Almost surely, 2^55581602897 is an apocalyptic number.

It is an amenable number.

55581602897 is a deficient number, since it is larger than the sum of its proper divisors (1).

55581602897 is an equidigital number, since it uses as much as digits as its factorization.

55581602897 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048000, while the sum is 56.

The spelling of 55581602897 in words is "fifty-five billion, five hundred eighty-one million, six hundred two thousand, eight hundred ninety-seven".