30667621057 has 2 divisors, whose sum is σ = 30667621058. Its totient is φ = 30667621056.

The previous prime is 30667620967. The next prime is 30667621079. The reversal of 30667621057 is 75012676603.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30612401296 + 55219761 = 174964^2 + 7431^2 .

It is an emirp because it is prime and its reverse (75012676603) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 30667621057 - 2³¹ = 28520137409 is a prime.

It is not a weakly prime, because it can be changed into another prime (30667621097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15333810528 + 15333810529.

It is an arithmetic number, because the mean of its divisors is an integer number (15333810529).

Almost surely, 2^30667621057 is an apocalyptic number.

It is an amenable number.

30667621057 is a deficient number, since it is larger than the sum of its proper divisors (1).

30667621057 is an equidigital number, since it uses as much as digits as its factorization.

30667621057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 317520, while the sum is 43.

The spelling of 30667621057 in words is "thirty billion, six hundred sixty-seven million, six hundred twenty-one thousand, fifty-seven".