61920209653 has 2 divisors, whose sum is σ = 61920209654. Its totient is φ = 61920209652.

The previous prime is 61920209639. The next prime is 61920209707. The reversal of 61920209653 is 35690202916.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60724294929 + 1195914724 = 246423^2 + 34582^2 .

It is a cyclic number.

It is not a de Polignac number, because 61920209653 - 2¹⁷ = 61920078581 is a prime.

It is a super-2 number, since 2×61920209653² (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 (61920209753) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30960104826 + 30960104827.

It is an arithmetic number, because the mean of its divisors is an integer number (30960104827).

Almost surely, 2^61920209653 is an apocalyptic number.

It is an amenable number.

61920209653 is a deficient number, since it is larger than the sum of its proper divisors (1).

61920209653 is an equidigital number, since it uses as much as digits as its factorization.

61920209653 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 174960, while the sum is 43.

The spelling of 61920209653 in words is "sixty-one billion, nine hundred twenty million, two hundred nine thousand, six hundred fifty-three".