81922006357 has 8 divisors (see below), whose sum is σ = 82406511360. Its totient is φ = 81437627760.

The previous prime is 81922006307. The next prime is 81922006373. The reversal of 81922006357 is 75360022918.

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

It is a cyclic number.

It is not a de Polignac number, because 81922006357 - 2²³ = 81913617749 is a prime.

It is a super-2 number, since 2×81922006357² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81922006307) 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, 1481232 + ... + 1535542.

It is an arithmetic number, because the mean of its divisors is an integer number (10300813920).

Almost surely, 2^81922006357 is an apocalyptic number.

It is an amenable number.

81922006357 is a deficient number, since it is larger than the sum of its proper divisors (484505003).

81922006357 is a wasteful number, since it uses less digits than its factorization.

81922006357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63203.

The product of its (nonzero) digits is 181440, while the sum is 43.

The spelling of 81922006357 in words is "eighty-one billion, nine hundred twenty-two million, six thousand, three hundred fifty-seven".