6157724021 has 2 divisors, whose sum is σ = 6157724022. Its totient is φ = 6157724020.

The previous prime is 6157724017. The next prime is 6157724051. The reversal of 6157724021 is 1204277516.

6157724021 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6144364996 + 13359025 = 78386^2 + 3655^2 .

It is a cyclic number.

It is not a de Polignac number, because 6157724021 - 2² = 6157724017 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6157724051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3078862010 + 3078862011.

It is an arithmetic number, because the mean of its divisors is an integer number (3078862011).

Almost surely, 2^6157724021 is an apocalyptic number.

It is an amenable number.

6157724021 is a deficient number, since it is larger than the sum of its proper divisors (1).

6157724021 is an equidigital number, since it uses as much as digits as its factorization.

6157724021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23520, while the sum is 35.

The square root of 6157724021 is about 78471.1668130403. The cubic root of 6157724021 is about 1832.9054963710.

The spelling of 6157724021 in words is "six billion, one hundred fifty-seven million, seven hundred twenty-four thousand, twenty-one".