51216155623 has 2 divisors, whose sum is σ = 51216155624. Its totient is φ = 51216155622.

The previous prime is 51216155597. The next prime is 51216155681. The reversal of 51216155623 is 32655161215.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51216155623 - 2¹³ = 51216147431 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51216155693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25608077811 + 25608077812.

It is an arithmetic number, because the mean of its divisors is an integer number (25608077812).

Almost surely, 2^51216155623 is an apocalyptic number.

51216155623 is a deficient number, since it is larger than the sum of its proper divisors (1).

51216155623 is an equidigital number, since it uses as much as digits as its factorization.

51216155623 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54000, while the sum is 37.

The spelling of 51216155623 in words is "fifty-one billion, two hundred sixteen million, one hundred fifty-five thousand, six hundred twenty-three".