6423999157 has 2 divisors, whose sum is σ = 6423999158. Its totient is φ = 6423999156.

The previous prime is 6423999097. The next prime is 6423999181. The reversal of 6423999157 is 7519993246.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4858926436 + 1565072721 = 69706^2 + 39561^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6423999157 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6423999098 and 6423999107.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6423991157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3211999578 + 3211999579.

It is an arithmetic number, because the mean of its divisors is an integer number (3211999579).

Almost surely, 2^6423999157 is an apocalyptic number.

It is an amenable number.

6423999157 is a deficient number, since it is larger than the sum of its proper divisors (1).

6423999157 is an equidigital number, since it uses as much as digits as its factorization.

6423999157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3674160, while the sum is 55.

The square root of 6423999157 is about 80149.8543791565. The cubic root of 6423999157 is about 1858.9533515828.

The spelling of 6423999157 in words is "six billion, four hundred twenty-three million, nine hundred ninety-nine thousand, one hundred fifty-seven".