30975802537681 has 4 divisors (see below), whose sum is σ = 32043933659700. Its totient is φ = 29907671415664.

The previous prime is 30975802537643. The next prime is 30975802537709. The reversal of 30975802537681 is 18673520857903.

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 25129005997456 + 5846796540225 = 5012884^2 + 2418015^2 .

It is a cyclic number.

It is not a de Polignac number, because 30975802537681 - 2¹⁷ = 30975802406609 is a prime.

It is a super-2 number, since 2×30975802537681² (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 (30975802337681) 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, 534065560966 + ... + 534065561023.

It is an arithmetic number, because the mean of its divisors is an integer number (8010983414925).

Almost surely, 2^{30975802537681} is an apocalyptic number.

It is an amenable number.

30975802537681 is a deficient number, since it is larger than the sum of its proper divisors (1068131122019).

30975802537681 is a wasteful number, since it uses less digits than its factorization.

30975802537681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1068131122018.

The product of its (nonzero) digits is 76204800, while the sum is 64.

The spelling of 30975802537681 in words is "thirty trillion, nine hundred seventy-five billion, eight hundred two million, five hundred thirty-seven thousand, six hundred eighty-one".