51530231740 has 96 divisors (see below), whose sum is σ = 126628669440. Its totient is φ = 17443641600.

The previous prime is 51530231729. The next prime is 51530231741. The reversal of 51530231740 is 4713203515.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51530231741) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15106 + ... + 321385.

It is an arithmetic number, because the mean of its divisors is an integer number (1319048640).

Almost surely, 2^51530231740 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 51530231740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63314334720).

51530231740 is an abundant number, since it is smaller than the sum of its proper divisors (75098437700).

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

51530231740 is a wasteful number, since it uses less digits than its factorization.

51530231740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336563 (or 336561 counting only the distinct ones).

The product of its (nonzero) digits is 12600, while the sum is 31.

The spelling of 51530231740 in words is "fifty-one billion, five hundred thirty million, two hundred thirty-one thousand, seven hundred forty".