51616526309 has 2 divisors, whose sum is σ = 51616526310. Its totient is φ = 51616526308.

The previous prime is 51616526303. The next prime is 51616526323. The reversal of 51616526309 is 90362561615.

51616526309 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28612737409 + 23003788900 = 169153^2 + 151670^2 .

It is a cyclic number.

It is not a de Polignac number, because 51616526309 - 2¹² = 51616522213 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51616526309.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51616526303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25808263154 + 25808263155.

It is an arithmetic number, because the mean of its divisors is an integer number (25808263155).

Almost surely, 2^51616526309 is an apocalyptic number.

It is an amenable number.

51616526309 is a deficient number, since it is larger than the sum of its proper divisors (1).

51616526309 is an equidigital number, since it uses as much as digits as its factorization.

51616526309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 291600, while the sum is 44.

The spelling of 51616526309 in words is "fifty-one billion, six hundred sixteen million, five hundred twenty-six thousand, three hundred nine".