51111660 has 48 divisors (see below), whose sum is σ = 143942400. Its totient is φ = 13550784.

The previous prime is 51111637. The next prime is 51111661. The reversal of 51111660 is 6611115.

It is a super-2 number, since 2×51111660² = 5224803575911200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51111661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8361 + ... + 13119.

It is an arithmetic number, because the mean of its divisors is an integer number (2998800).

Almost surely, 2^51111660 is an apocalyptic number.

It is an amenable number.

51111660 is an abundant number, since it is smaller than the sum of its proper divisors (92830740).

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

51111660 is a wasteful number, since it uses less digits than its factorization.

51111660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4950 (or 4948 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 21.

The square root of 51111660 is about 7149.2419178539. The cubic root of 51111660 is about 371.1134223093.

Adding to 51111660 its reverse (6611115), we get a palindrome (57722775).

The spelling of 51111660 in words is "fifty-one million, one hundred eleven thousand, six hundred sixty".