51257984546 has 8 divisors (see below), whose sum is σ = 77376703260. Its totient is φ = 25465750128.

The previous prime is 51257984527. The next prime is 51257984549. The reversal of 51257984546 is 64548975215.

It can be written as a sum of positive squares in 2 ways, for example, as 51138847321 + 119137225 = 226139^2 + 10915^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×51257984546² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51257984491 and 51257984500.

It is not an unprimeable number, because it can be changed into a prime (51257984549) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81620681 + ... + 81621308.

Almost surely, 2^51257984546 is an apocalyptic number.

51257984546 is a deficient number, since it is larger than the sum of its proper divisors (26118718714).

51257984546 is a wasteful number, since it uses less digits than its factorization.

51257984546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163242148.

The product of its digits is 12096000, while the sum is 56.

The spelling of 51257984546 in words is "fifty-one billion, two hundred fifty-seven million, nine hundred eighty-four thousand, five hundred forty-six".