30120135405257 has 4 divisors (see below), whose sum is σ = 30120258464016. Its totient is φ = 30120012346500.

The previous prime is 30120135405251. The next prime is 30120135405293. The reversal of 30120135405257 is 75250453102103.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 30120135405257 - 2³² = 30115840437961 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 30120135405257.

It is not an unprimeable number, because it can be changed into a prime (30120135405251) 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, 61161503 + ... + 61652004.

It is an arithmetic number, because the mean of its divisors is an integer number (7530064616004).

Almost surely, 2^{30120135405257} is an apocalyptic number.

It is an amenable number.

30120135405257 is a deficient number, since it is larger than the sum of its proper divisors (123058759).

30120135405257 is a wasteful number, since it uses less digits than its factorization.

30120135405257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123058758.

The product of its (nonzero) digits is 126000, while the sum is 38.

The spelling of 30120135405257 in words is "thirty trillion, one hundred twenty billion, one hundred thirty-five million, four hundred five thousand, two hundred fifty-seven".