81930452261 has 8 divisors (see below), whose sum is σ = 96863589120. Its totient is φ = 67804512048.

The previous prime is 81930452249. The next prime is 81930452287. The reversal of 81930452261 is 16225403918.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81930452261 - 2²² = 81926257957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81930452861) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 201798941 + ... + 201799346.

It is an arithmetic number, because the mean of its divisors is an integer number (12107948640).

Almost surely, 2^81930452261 is an apocalyptic number.

It is an amenable number.

81930452261 is a deficient number, since it is larger than the sum of its proper divisors (14933136859).

81930452261 is a wasteful number, since it uses less digits than its factorization.

81930452261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403598323.

The product of its (nonzero) digits is 103680, while the sum is 41.

The spelling of 81930452261 in words is "eighty-one billion, nine hundred thirty million, four hundred fifty-two thousand, two hundred sixty-one".