51515641049 has 8 divisors (see below), whose sum is σ = 52602522600. Its totient is φ = 50439062016.

The previous prime is 51515641027. The next prime is 51515641061. The reversal of 51515641049 is 94014651515.

It can be written as a sum of positive squares in 4 ways, for example, as 27836586649 + 23679054400 = 166843^2 + 153880^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 51515641049 - 2²⁴ = 51498863833 is a prime.

It is a super-2 number, since 2×51515641049² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51515640997 and 51515641015.

It is not an unprimeable number, because it can be changed into a prime (51515641549) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2565524 + ... + 2585525.

It is an arithmetic number, because the mean of its divisors is an integer number (6575315325).

Almost surely, 2^51515641049 is an apocalyptic number.

It is an amenable number.

51515641049 is a deficient number, since it is larger than the sum of its proper divisors (1086881551).

51515641049 is a wasteful number, since it uses less digits than its factorization.

51515641049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5151259.

The product of its (nonzero) digits is 108000, while the sum is 41.

The spelling of 51515641049 in words is "fifty-one billion, five hundred fifteen million, six hundred forty-one thousand, forty-nine".