51740781156 has 45 divisors (see below), whose sum is σ = 135271326729. Its totient is φ = 17245562256.

The previous prime is 51740781151. The next prime is 51740781161. The reversal of 51740781156 is 65118704715.

The square root of 51740781156 is 227466.

It is a perfect power (a square), and thus also a powerful number.

51740781156 is a `hidden beast` number, since 5 + 17 + 407 + 81 + 156 = 666.

It is an interprime number because it is at equal distance from previous prime (51740781151) and next prime (51740781161).

It can be written as a sum of positive squares in only one way, i.e., 4991422500 + 46749358656 = 70650^2 + 216216^2 .

It is not an unprimeable number, because it can be changed into a prime (51740781151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 4088070 + ... + 4100706.

Almost surely, 2^51740781156 is an apocalyptic number.

51740781156 is the 227466-th square number.

It is an amenable number.

51740781156 is an abundant number, since it is smaller than the sum of its proper divisors (83530545573).

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

51740781156 is an frugal number, since it uses more digits than its factorization.

51740781156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25290 (or 12642 counting only the distinct ones).

The product of its (nonzero) digits is 235200, while the sum is 45.

The spelling of 51740781156 in words is "fifty-one billion, seven hundred forty million, seven hundred eighty-one thousand, one hundred fifty-six".