51977847966 has 64 divisors (see below), whose sum is σ = 118010787840. Its totient is φ = 15123759840.

The previous prime is 51977847941. The next prime is 51977848049. The reversal of 51977847966 is 66974877915.

It is a happy number.

It is a super-2 number, since 2×51977847966² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 51977847966.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12231 + ... + 322653.

It is an arithmetic number, because the mean of its divisors is an integer number (1843918560).

Almost surely, 2^51977847966 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51977847966, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (59005393920).

51977847966 is an abundant number, since it is smaller than the sum of its proper divisors (66032939874).

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

51977847966 is a wasteful number, since it uses less digits than its factorization.

51977847966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310541.

The product of its digits is 160030080, while the sum is 69.

The spelling of 51977847966 in words is "fifty-one billion, nine hundred seventy-seven million, eight hundred forty-seven thousand, nine hundred sixty-six".