51545654521 has 2 divisors, whose sum is σ = 51545654522. Its totient is φ = 51545654520.

The previous prime is 51545654513. The next prime is 51545654551. The reversal of 51545654521 is 12545654515.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45512248896 + 6033405625 = 213336^2 + 77675^2 .

It is a cyclic number.

It is not a de Polignac number, because 51545654521 - 2³ = 51545654513 is a prime.

It is not a weakly prime, because it can be changed into another prime (51545654551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25772827260 + 25772827261.

It is an arithmetic number, because the mean of its divisors is an integer number (25772827261).

Almost surely, 2^51545654521 is an apocalyptic number.

It is an amenable number.

51545654521 is a deficient number, since it is larger than the sum of its proper divisors (1).

51545654521 is an equidigital number, since it uses as much as digits as its factorization.

51545654521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 600000, while the sum is 43.

The spelling of 51545654521 in words is "fifty-one billion, five hundred forty-five million, six hundred fifty-four thousand, five hundred twenty-one".