51738193920 has 208 divisors, whose sum is σ = 189192441600. Its totient is φ = 11825774592.

The previous prime is 51738193909. The next prime is 51738193931. The reversal of 51738193920 is 2939183715.

It is an interprime number because it is at equal distance from previous prime (51738193909) and next prime (51738193931).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 51738193920.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 369931 + ... + 490229.

Almost surely, 2^51738193920 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 51738193920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94596220800).

51738193920 is an abundant number, since it is smaller than the sum of its proper divisors (137454247680).

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

51738193920 is a wasteful number, since it uses less digits than its factorization.

51738193920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120338 (or 120316 counting only the distinct ones).

The product of its (nonzero) digits is 408240, while the sum is 48.

The spelling of 51738193920 in words is "fifty-one billion, seven hundred thirty-eight million, one hundred ninety-three thousand, nine hundred twenty".