30475720505 has 4 divisors (see below), whose sum is σ = 36570864612. Its totient is φ = 24380576400.

The previous prime is 30475720501. The next prime is 30475720543. The reversal of 30475720505 is 50502757403.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3781389049 + 26694331456 = 61493^2 + 163384^2 .

It is not a de Polignac number, because 30475720505 - 2² = 30475720501 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30475720501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3047572046 + ... + 3047572055.

It is an arithmetic number, because the mean of its divisors is an integer number (9142716153).

Almost surely, 2^30475720505 is an apocalyptic number.

It is an amenable number.

30475720505 is a deficient number, since it is larger than the sum of its proper divisors (6095144107).

30475720505 is an equidigital number, since it uses as much as digits as its factorization.

30475720505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6095144106.

The product of its (nonzero) digits is 147000, while the sum is 38.

The spelling of 30475720505 in words is "thirty billion, four hundred seventy-five million, seven hundred twenty thousand, five hundred five".