30145721437 has 16 divisors (see below), whose sum is σ = 33547171840. Its totient is φ = 26928834480.

The previous prime is 30145721413. The next prime is 30145721449. The reversal of 30145721437 is 73412754103.

It is a de Polignac number, because none of the positive numbers 2^k-30145721437 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 30145721396 and 30145721405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30145721477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 348364 + ... + 426202.

It is an arithmetic number, because the mean of its divisors is an integer number (2096698240).

Almost surely, 2^30145721437 is an apocalyptic number.

It is an amenable number.

30145721437 is a deficient number, since it is larger than the sum of its proper divisors (3401450403).

30145721437 is an frugal number, since it uses more digits than its factorization.

30145721437 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77945 (or 77883 counting only the distinct ones).

The product of its (nonzero) digits is 70560, while the sum is 37.

The spelling of 30145721437 in words is "thirty billion, one hundred forty-five million, seven hundred twenty-one thousand, four hundred thirty-seven".