7638078157 has 2 divisors, whose sum is σ = 7638078158. Its totient is φ = 7638078156.

The previous prime is 7638078143. The next prime is 7638078191. The reversal of 7638078157 is 7518708367.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7612737001 + 25341156 = 87251^2 + 5034^2 .

It is a cyclic number.

It is not a de Polignac number, because 7638078157 - 2³¹ = 5490594509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7638076157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3819039078 + 3819039079.

It is an arithmetic number, because the mean of its divisors is an integer number (3819039079).

Almost surely, 2^7638078157 is an apocalyptic number.

It is an amenable number.

7638078157 is a deficient number, since it is larger than the sum of its proper divisors (1).

7638078157 is an equidigital number, since it uses as much as digits as its factorization.

7638078157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1975680, while the sum is 52.

The square root of 7638078157 is about 87396.0992092897. The cubic root of 7638078157 is about 1969.3732412277.

The spelling of 7638078157 in words is "seven billion, six hundred thirty-eight million, seventy-eight thousand, one hundred fifty-seven".