51660011520 has 576 divisors, whose sum is σ = 200083534560. Its totient is φ = 12708347904.

The previous prime is 51660011489. The next prime is 51660011551. The reversal of 51660011520 is 2511006615.

It is a happy number.

51660011520 is a `hidden beast` number, since 5 + 1 + 6 + 600 + 1 + 1 + 52 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (51660011489) and next prime (51660011551).

It is a tau number, because it is divible by the number of its divisors (576).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 32347362 + ... + 32348958.

Almost surely, 2^51660011520 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51660011520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100041767280).

51660011520 is an abundant number, since it is smaller than the sum of its proper divisors (148423523040).

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

51660011520 is a wasteful number, since it uses less digits than its factorization.

51660011520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1652 (or 1620 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

The spelling of 51660011520 in words is "fifty-one billion, six hundred sixty million, eleven thousand, five hundred twenty".