81630725503 has 2 divisors, whose sum is σ = 81630725504. Its totient is φ = 81630725502.

The previous prime is 81630725497. The next prime is 81630725569. The reversal of 81630725503 is 30552703618.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81630725503 is a prime.

It is a super-2 number, since 2×81630725503² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81630725593) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40815362751 + 40815362752.

It is an arithmetic number, because the mean of its divisors is an integer number (40815362752).

Almost surely, 2^81630725503 is an apocalyptic number.

81630725503 is a deficient number, since it is larger than the sum of its proper divisors (1).

81630725503 is an equidigital number, since it uses as much as digits as its factorization.

81630725503 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 151200, while the sum is 40.

The spelling of 81630725503 in words is "eighty-one billion, six hundred thirty million, seven hundred twenty-five thousand, five hundred three".