61842685381 has 2 divisors, whose sum is σ = 61842685382. Its totient is φ = 61842685380.

The previous prime is 61842685291. The next prime is 61842685403. The reversal of 61842685381 is 18358624816.

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., 37933794756 + 23908890625 = 194766^2 + 154625^2 .

It is a cyclic number.

It is not a de Polignac number, because 61842685381 - 2²⁹ = 61305814469 is a prime.

It is a super-2 number, since 2×61842685381² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61842685481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30921342690 + 30921342691.

It is an arithmetic number, because the mean of its divisors is an integer number (30921342691).

Almost surely, 2^61842685381 is an apocalyptic number.

It is an amenable number.

61842685381 is a deficient number, since it is larger than the sum of its proper divisors (1).

61842685381 is an equidigital number, since it uses as much as digits as its factorization.

61842685381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2211840, while the sum is 52.

The spelling of 61842685381 in words is "sixty-one billion, eight hundred forty-two million, six hundred eighty-five thousand, three hundred eighty-one".