51111789940572 has 12 divisors (see below), whose sum is σ = 119260843194696. Its totient is φ = 17037263313520.

The previous prime is 51111789940571. The next prime is 51111789940573. The reversal of 51111789940572 is 27504998711115.

It is an interprime number because it is at equal distance from previous prime (51111789940571) and next prime (51111789940573).

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×51111789940572² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51111789940571) 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, 2129657914179 + ... + 2129657914202.

It is an arithmetic number, because the mean of its divisors is an integer number (9938403599558).

Almost surely, 2^{51111789940572} is an apocalyptic number.

It is an amenable number.

51111789940572 is an abundant number, since it is smaller than the sum of its proper divisors (68149053254124).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51111789940572 is a wasteful number, since it uses less digits than its factorization.

51111789940572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4259315828388 (or 4259315828386 counting only the distinct ones).

The product of its (nonzero) digits is 6350400, while the sum is 60.

The spelling of 51111789940572 in words is "fifty-one trillion, one hundred eleven billion, seven hundred eighty-nine million, nine hundred forty thousand, five hundred seventy-two".