51161758542 has 16 divisors (see below), whose sum is σ = 113692796880. Its totient is φ = 17053919496.

The previous prime is 51161758537. The next prime is 51161758573. The reversal of 51161758542 is 24585716115.

51161758542 is a `hidden beast` number, since 5 + 1 + 1 + 61 + 7 + 585 + 4 + 2 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 473719933 + ... + 473720040.

It is an arithmetic number, because the mean of its divisors is an integer number (7105799805).

Almost surely, 2^51161758542 is an apocalyptic number.

51161758542 is an abundant number, since it is smaller than the sum of its proper divisors (62531038338).

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

51161758542 is a wasteful number, since it uses less digits than its factorization.

51161758542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 947439984 (or 947439978 counting only the distinct ones).

The product of its digits is 336000, while the sum is 45.

The spelling of 51161758542 in words is "fifty-one billion, one hundred sixty-one million, seven hundred fifty-eight thousand, five hundred forty-two".