61642518229 has 2 divisors, whose sum is σ = 61642518230. Its totient is φ = 61642518228.

The previous prime is 61642518191. The next prime is 61642518271. The reversal of 61642518229 is 92281524616.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55436702500 + 6205815729 = 235450^2 + 78777^2 .

It is a cyclic number.

It is not a de Polignac number, because 61642518229 - 2¹³ = 61642510037 is a prime.

It is a super-2 number, since 2×61642518229² (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 (61642518529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30821259114 + 30821259115.

It is an arithmetic number, because the mean of its divisors is an integer number (30821259115).

Almost surely, 2^61642518229 is an apocalyptic number.

It is an amenable number.

61642518229 is a deficient number, since it is larger than the sum of its proper divisors (1).

61642518229 is an equidigital number, since it uses as much as digits as its factorization.

61642518229 is an evil number, because the sum of its binary digits is even.

The product of its digits is 414720, while the sum is 46.

The spelling of 61642518229 in words is "sixty-one billion, six hundred forty-two million, five hundred eighteen thousand, two hundred twenty-nine".