31561115663104 has 18 divisors (see below), whose sum is σ = 62998945718660. Its totient is φ = 15780557831424.

The previous prime is 31561115663023. The next prime is 31561115663107. The reversal of 31561115663104 is 40136651116513.

It is a super-2 number, since 2×31561115663104² (a number of 28 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31561115663107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61642803774 + ... + 61642804285.

Almost surely, 2^{31561115663104} is an apocalyptic number.

It is an amenable number.

31561115663104 is a deficient number, since it is larger than the sum of its proper divisors (31437830055556).

31561115663104 is an equidigital number, since it uses as much as digits as its factorization.

31561115663104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123285608075 (or 123285608061 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 43.

Adding to 31561115663104 its reverse (40136651116513), we get a palindrome (71697766779617).

The spelling of 31561115663104 in words is "thirty-one trillion, five hundred sixty-one billion, one hundred fifteen million, six hundred sixty-three thousand, one hundred four".