61555438297 has 2 divisors, whose sum is σ = 61555438298. Its totient is φ = 61555438296.

The previous prime is 61555438289. The next prime is 61555438327. The reversal of 61555438297 is 79283455516.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38579245056 + 22976193241 = 196416^2 + 151579^2 .

It is a cyclic number.

It is not a de Polignac number, because 61555438297 - 2³ = 61555438289 is a prime.

It is not a weakly prime, because it can be changed into another prime (61555438237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30777719148 + 30777719149.

It is an arithmetic number, because the mean of its divisors is an integer number (30777719149).

Almost surely, 2^61555438297 is an apocalyptic number.

It is an amenable number.

61555438297 is a deficient number, since it is larger than the sum of its proper divisors (1).

61555438297 is an equidigital number, since it uses as much as digits as its factorization.

61555438297 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9072000, while the sum is 55.

The spelling of 61555438297 in words is "sixty-one billion, five hundred fifty-five million, four hundred thirty-eight thousand, two hundred ninety-seven".