30640721892481 has 4 divisors (see below), whose sum is σ = 30662623768000. Its totient is φ = 30618820016964.

The previous prime is 30640721892461. The next prime is 30640721892503. The reversal of 30640721892481 is 18429812704603.

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 30640721892481 - 2³¹ = 30638574408833 is a prime.

It is a super-2 number, since 2×30640721892481² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30640721892421) 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, 10950935661 + ... + 10950938458.

It is an arithmetic number, because the mean of its divisors is an integer number (7665655942000).

Almost surely, 2^{30640721892481} is an apocalyptic number.

It is an amenable number.

30640721892481 is a deficient number, since it is larger than the sum of its proper divisors (21901875519).

30640721892481 is a wasteful number, since it uses less digits than its factorization.

30640721892481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21901875518.

The product of its (nonzero) digits is 4644864, while the sum is 55.

The spelling of 30640721892481 in words is "thirty trillion, six hundred forty billion, seven hundred twenty-one million, eight hundred ninety-two thousand, four hundred eighty-one".