51520415503 has 2 divisors, whose sum is σ = 51520415504. Its totient is φ = 51520415502.

The previous prime is 51520415473. The next prime is 51520415539. The reversal of 51520415503 is 30551402515.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51520415503 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51520415603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25760207751 + 25760207752.

It is an arithmetic number, because the mean of its divisors is an integer number (25760207752).

Almost surely, 2^51520415503 is an apocalyptic number.

51520415503 is a deficient number, since it is larger than the sum of its proper divisors (1).

51520415503 is an equidigital number, since it uses as much as digits as its factorization.

51520415503 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15000, while the sum is 31.

The spelling of 51520415503 in words is "fifty-one billion, five hundred twenty million, four hundred fifteen thousand, five hundred three".