51660091152 has 120 divisors (see below), whose sum is σ = 145584233600. Its totient is φ = 17100357120.

The previous prime is 51660091139. The next prime is 51660091157. The reversal of 51660091152 is 25119006615.

51660091152 is a `hidden beast` number, since 516 + 6 + 0 + 0 + 91 + 1 + 52 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (51660091157) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18080508 + ... + 18083364.

Almost surely, 2^51660091152 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 51660091152, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72792116800).

51660091152 is an abundant number, since it is smaller than the sum of its proper divisors (93924142448).

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

51660091152 is a wasteful number, since it uses less digits than its factorization.

51660091152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3701 (or 3692 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 36.

Adding to 51660091152 its reverse (25119006615), we get a palindrome (76779097767).

The spelling of 51660091152 in words is "fifty-one billion, six hundred sixty million, ninety-one thousand, one hundred fifty-two".