30206615381 has 8 divisors (see below), whose sum is σ = 30469606200. Its totient is φ = 29944732608.

The previous prime is 30206615353. The next prime is 30206615389. The reversal of 30206615381 is 18351660203.

It can be written as a sum of positive squares in 4 ways, for example, as 11441725156 + 18764890225 = 106966^2 + 136985^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30206615381 is a prime.

It is a super-2 number, since 2×30206615381² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30206615389) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 222206 + ... + 331343.

It is an arithmetic number, because the mean of its divisors is an integer number (3808700775).

Almost surely, 2^30206615381 is an apocalyptic number.

It is an amenable number.

30206615381 is a deficient number, since it is larger than the sum of its proper divisors (262990819).

30206615381 is a wasteful number, since it uses less digits than its factorization.

30206615381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 554023.

The product of its (nonzero) digits is 25920, while the sum is 35.

The spelling of 30206615381 in words is "thirty billion, two hundred six million, six hundred fifteen thousand, three hundred eighty-one".