51691091012 has 24 divisors (see below), whose sum is σ = 100544939712. Its totient is φ = 23052629600.

The previous prime is 51691090967. The next prime is 51691091027. The reversal of 51691091012 is 21019019615.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11080664 + ... + 11085327.

It is an arithmetic number, because the mean of its divisors is an integer number (4189372488).

Almost surely, 2^51691091012 is an apocalyptic number.

It is an amenable number.

51691091012 is a deficient number, since it is larger than the sum of its proper divisors (48853848700).

51691091012 is a wasteful number, since it uses less digits than its factorization.

51691091012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22166059 (or 22166057 counting only the distinct ones).

The product of its (nonzero) digits is 4860, while the sum is 35.

The spelling of 51691091012 in words is "fifty-one billion, six hundred ninety-one million, ninety-one thousand, twelve".