30478137857 has 2 divisors, whose sum is σ = 30478137858. Its totient is φ = 30478137856.

The previous prime is 30478137839. The next prime is 30478137901. The reversal of 30478137857 is 75873187403.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22550728561 + 7927409296 = 150169^2 + 89036^2 .

It is a cyclic number.

It is not a de Polignac number, because 30478137857 - 2⁸ = 30478137601 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 30478137799 and 30478137808.

It is not a weakly prime, because it can be changed into another prime (30478137817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15239068928 + 15239068929.

It is an arithmetic number, because the mean of its divisors is an integer number (15239068929).

Almost surely, 2^30478137857 is an apocalyptic number.

It is an amenable number.

30478137857 is a deficient number, since it is larger than the sum of its proper divisors (1).

30478137857 is an equidigital number, since it uses as much as digits as its factorization.

30478137857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3951360, while the sum is 53.

The spelling of 30478137857 in words is "thirty billion, four hundred seventy-eight million, one hundred thirty-seven thousand, eight hundred fifty-seven".