55202401997 has 2 divisors, whose sum is σ = 55202401998. Its totient is φ = 55202401996.

The previous prime is 55202401979. The next prime is 55202402029. The reversal of 55202401997 is 79910420255.

Together with previous prime (55202401979) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37553013796 + 17649388201 = 193786^2 + 132851^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55202401997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55202400997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27601200998 + 27601200999.

It is an arithmetic number, because the mean of its divisors is an integer number (27601200999).

Almost surely, 2^55202401997 is an apocalyptic number.

It is an amenable number.

55202401997 is a deficient number, since it is larger than the sum of its proper divisors (1).

55202401997 is an equidigital number, since it uses as much as digits as its factorization.

55202401997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 226800, while the sum is 44.

The spelling of 55202401997 in words is "fifty-five billion, two hundred two million, four hundred one thousand, nine hundred ninety-seven".