51111211412 has 6 divisors (see below), whose sum is σ = 89444619978. Its totient is φ = 25555605704.

The previous prime is 51111211379. The next prime is 51111211429. The reversal of 51111211412 is 21411211115.

It can be written as a sum of positive squares in only one way, i.e., 35296639876 + 15814571536 = 187874^2 + 125756^2 .

It is a super-2 number, since 2×51111211412² (a number of 22 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 as a sum of consecutive naturals, namely, 6388901423 + ... + 6388901430.

It is an arithmetic number, because the mean of its divisors is an integer number (14907436663).

Almost surely, 2^51111211412 is an apocalyptic number.

It is an amenable number.

51111211412 is a deficient number, since it is larger than the sum of its proper divisors (38333408566).

51111211412 is a wasteful number, since it uses less digits than its factorization.

51111211412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12777802857 (or 12777802855 counting only the distinct ones).

The product of its digits is 80, while the sum is 20.

Adding to 51111211412 its reverse (21411211115), we get a palindrome (72522422527).

The spelling of 51111211412 in words is "fifty-one billion, one hundred eleven million, two hundred eleven thousand, four hundred twelve".