81762680625 has 20 divisors (see below), whose sum is σ = 136227530736. Its totient is φ = 43606762000.

The previous prime is 81762680609. The next prime is 81762680647. The reversal of 81762680625 is 52608626718.

It is a happy number.

It is not a de Polignac number, because 81762680625 - 2⁴ = 81762680609 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 21801507 + ... + 21805256.

Almost surely, 2^81762680625 is an apocalyptic number.

It is an amenable number.

81762680625 is a deficient number, since it is larger than the sum of its proper divisors (54464850111).

81762680625 is an equidigital number, since it uses as much as digits as its factorization.

81762680625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43606786 (or 43606771 counting only the distinct ones).

The product of its (nonzero) digits is 1935360, while the sum is 51.

The spelling of 81762680625 in words is "eighty-one billion, seven hundred sixty-two million, six hundred eighty thousand, six hundred twenty-five".