61820651057329 has 2 divisors, whose sum is σ = 61820651057330. Its totient is φ = 61820651057328.

The previous prime is 61820651057317. The next prime is 61820651057351. The reversal of 61820651057329 is 92375015602816.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54991716609600 + 6828934447729 = 7415640^2 + 2613223^2 .

It is a cyclic number.

It is not a de Polignac number, because 61820651057329 - 2⁷ = 61820651057201 is a prime.

It is a super-2 number, since 2×61820651057329² (a number of 28 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 61820651057329.

It is not a weakly prime, because it can be changed into another prime (61820651051329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30910325528664 + 30910325528665.

It is an arithmetic number, because the mean of its divisors is an integer number (30910325528665).

Almost surely, 2^{61820651057329} is an apocalyptic number.

It is an amenable number.

61820651057329 is a deficient number, since it is larger than the sum of its proper divisors (1).

61820651057329 is an equidigital number, since it uses as much as digits as its factorization.

61820651057329 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5443200, while the sum is 55.

The spelling of 61820651057329 in words is "sixty-one trillion, eight hundred twenty billion, six hundred fifty-one million, fifty-seven thousand, three hundred twenty-nine".