30506490857 has 2 divisors, whose sum is σ = 30506490858. Its totient is φ = 30506490856.

The previous prime is 30506490829. The next prime is 30506490893. The reversal of 30506490857 is 75809460503.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20394981721 + 10111509136 = 142811^2 + 100556^2 .

It is a cyclic number.

It is not a de Polignac number, because 30506490857 - 2¹² = 30506486761 is a prime.

It is not a weakly prime, because it can be changed into another prime (30506496857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15253245428 + 15253245429.

It is an arithmetic number, because the mean of its divisors is an integer number (15253245429).

Almost surely, 2^30506490857 is an apocalyptic number.

It is an amenable number.

30506490857 is a deficient number, since it is larger than the sum of its proper divisors (1).

30506490857 is an equidigital number, since it uses as much as digits as its factorization.

30506490857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 907200, while the sum is 47.

The spelling of 30506490857 in words is "thirty billion, five hundred six million, four hundred ninety thousand, eight hundred fifty-seven".