51188693880 has 64 divisors (see below), whose sum is σ = 162599387040. Its totient is φ = 12847357952.

The previous prime is 51188693873. The next prime is 51188693887. The reversal of 51188693880 is 8839688115.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (51188693873) and next prime (51188693887).

It is a super-2 number, since 2×51188693880² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51188693880.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51188693887) 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, 12544209 + ... + 12548288.

Almost surely, 2^51188693880 is an apocalyptic number.

It is an amenable number.

51188693880 is an abundant number, since it is smaller than the sum of its proper divisors (111410693160).

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

51188693880 is a wasteful number, since it uses less digits than its factorization.

51188693880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25092528 (or 25092524 counting only the distinct ones).

The product of its (nonzero) digits is 3317760, while the sum is 57.

The spelling of 51188693880 in words is "fifty-one billion, one hundred eighty-eight million, six hundred ninety-three thousand, eight hundred eighty".