6181920653 has 2 divisors, whose sum is σ = 6181920654. Its totient is φ = 6181920652.

The previous prime is 6181920629. The next prime is 6181920709. The reversal of 6181920653 is 3560291816.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5763390889 + 418529764 = 75917^2 + 20458^2 .

It is a cyclic number.

It is not a de Polignac number, because 6181920653 - 2¹² = 6181916557 is a prime.

It is a super-2 number, since 2×6181920653² = 76432285919975892818, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 6181920653.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6181920253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3090960326 + 3090960327.

It is an arithmetic number, because the mean of its divisors is an integer number (3090960327).

Almost surely, 2^6181920653 is an apocalyptic number.

It is an amenable number.

6181920653 is a deficient number, since it is larger than the sum of its proper divisors (1).

6181920653 is an equidigital number, since it uses as much as digits as its factorization.

6181920653 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 77760, while the sum is 41.

The square root of 6181920653 is about 78625.1909568428. The cubic root of 6181920653 is about 1835.3031449814.

The spelling of 6181920653 in words is "six billion, one hundred eighty-one million, nine hundred twenty thousand, six hundred fifty-three".