51521355407 has 2 divisors, whose sum is σ = 51521355408. Its totient is φ = 51521355406.

The previous prime is 51521355323. The next prime is 51521355409. The reversal of 51521355407 is 70455312515.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51521355407 - 2¹⁶ = 51521289871 is a prime.

Together with 51521355409, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51521355409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25760677703 + 25760677704.

It is an arithmetic number, because the mean of its divisors is an integer number (25760677704).

Almost surely, 2^51521355407 is an apocalyptic number.

51521355407 is a deficient number, since it is larger than the sum of its proper divisors (1).

51521355407 is an equidigital number, since it uses as much as digits as its factorization.

51521355407 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 105000, while the sum is 38.

The spelling of 51521355407 in words is "fifty-one billion, five hundred twenty-one million, three hundred fifty-five thousand, four hundred seven".