991518338476412 has 24 divisors (see below), whose sum is σ = 1737423877150080. Its totient is φ = 495111651579440.

The previous prime is 991518338476357. The next prime is 991518338476439. The reversal of 991518338476412 is 214674833815199.

It is a super-2 number, since 2×991518338476412² (a number of 31 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12466487 + ... + 46243377.

It is an arithmetic number, because the mean of its divisors is an integer number (72392661547920).

Almost surely, 2^{991518338476412} is an apocalyptic number.

It is an amenable number.

991518338476412 is a deficient number, since it is larger than the sum of its proper divisors (745905538673668).

991518338476412 is a wasteful number, since it uses less digits than its factorization.

991518338476412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33786481 (or 33786479 counting only the distinct ones).

The product of its digits is 313528320, while the sum is 71.

The spelling of 991518338476412 in words is "nine hundred ninety-one trillion, five hundred eighteen billion, three hundred thirty-eight million, four hundred seventy-six thousand, four hundred twelve".