61855933955801 has 2 divisors, whose sum is σ = 61855933955802. Its totient is φ = 61855933955800.

The previous prime is 61855933955749. The next prime is 61855933955839. The reversal of 61855933955801 is 10855933955816.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34080504298201 + 27775429657600 = 5837851^2 + 5270240^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61855933955801 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (61855933955861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30927966977900 + 30927966977901.

It is an arithmetic number, because the mean of its divisors is an integer number (30927966977901).

Almost surely, 2^{61855933955801} is an apocalyptic number.

It is an amenable number.

61855933955801 is a deficient number, since it is larger than the sum of its proper divisors (1).

61855933955801 is an equidigital number, since it uses as much as digits as its factorization.

61855933955801 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 174960000, while the sum is 68.

The spelling of 61855933955801 in words is "sixty-one trillion, eight hundred fifty-five billion, nine hundred thirty-three million, nine hundred fifty-five thousand, eight hundred one".