51511780000 has 60 divisors (see below), whose sum is σ = 126726754770. Its totient is φ = 20604704000.

The previous prime is 51511779989. The next prime is 51511780031. The reversal of 51511780000 is 8711515.

It can be written as a sum of positive squares in 5 ways, for example, as 3387705616 + 48124074384 = 58204^2 + 219372^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1267795 + ... + 1307794.

Almost surely, 2^51511780000 is an apocalyptic number.

51511780000 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

51511780000 is an abundant number, since it is smaller than the sum of its proper divisors (75214974770).

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

51511780000 is an equidigital number, since it uses as much as digits as its factorization.

51511780000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2575619 (or 2575596 counting only the distinct ones).

The product of its (nonzero) digits is 1400, while the sum is 28.

The spelling of 51511780000 in words is "fifty-one billion, five hundred eleven million, seven hundred eighty thousand".