81630041757 has 16 divisors (see below), whose sum is σ = 120165147648. Its totient is φ = 48876693680.

The previous prime is 81630041749. The next prime is 81630041833. The reversal of 81630041757 is 75714003618.

It is a cyclic number.

It is not a de Polignac number, because 81630041757 - 2³ = 81630041749 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81630041747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14898693 + ... + 14904170.

It is an arithmetic number, because the mean of its divisors is an integer number (7510321728).

Almost surely, 2^81630041757 is an apocalyptic number.

It is an amenable number.

81630041757 is a deficient number, since it is larger than the sum of its proper divisors (38535105891).

81630041757 is a wasteful number, since it uses less digits than its factorization.

81630041757 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29802960.

The product of its (nonzero) digits is 141120, while the sum is 42.

The spelling of 81630041757 in words is "eighty-one billion, six hundred thirty million, forty-one thousand, seven hundred fifty-seven".