61801610869 has 2 divisors, whose sum is σ = 61801610870. Its totient is φ = 61801610868.

The previous prime is 61801610867. The next prime is 61801610879. The reversal of 61801610869 is 96801610816.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61429622500 + 371988369 = 247850^2 + 19287^2 .

It is a cyclic number.

It is not a de Polignac number, because 61801610869 - 2¹ = 61801610867 is a prime.

It is a super-2 number, since 2×61801610869² (a number of 22 digits) contains 22 as substring.

Together with 61801610867, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61801610867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30900805434 + 30900805435.

It is an arithmetic number, because the mean of its divisors is an integer number (30900805435).

Almost surely, 2^61801610869 is an apocalyptic number.

It is an amenable number.

61801610869 is a deficient number, since it is larger than the sum of its proper divisors (1).

61801610869 is an equidigital number, since it uses as much as digits as its factorization.

61801610869 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 124416, while the sum is 46.

The spelling of 61801610869 in words is "sixty-one billion, eight hundred one million, six hundred ten thousand, eight hundred sixty-nine".