7420136257 has 2 divisors, whose sum is σ = 7420136258. Its totient is φ = 7420136256.

The previous prime is 7420136159. The next prime is 7420136267. The reversal of 7420136257 is 7526310247.

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., 5752312336 + 1667823921 = 75844^2 + 40839^2 .

It is a cyclic number.

It is not a de Polignac number, because 7420136257 - 2²³ = 7411747649 is a prime.

It is not a weakly prime, because it can be changed into another prime (7420136267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3710068128 + 3710068129.

It is an arithmetic number, because the mean of its divisors is an integer number (3710068129).

Almost surely, 2^7420136257 is an apocalyptic number.

It is an amenable number.

7420136257 is a deficient number, since it is larger than the sum of its proper divisors (1).

7420136257 is an equidigital number, since it uses as much as digits as its factorization.

7420136257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 70560, while the sum is 37.

The square root of 7420136257 is about 86140.2127754512. The cubic root of 7420136257 is about 1950.4611013024.

The spelling of 7420136257 in words is "seven billion, four hundred twenty million, one hundred thirty-six thousand, two hundred fifty-seven".