81522226749 has 8 divisors (see below), whose sum is σ = 110005896672. Its totient is φ = 53693354000.

The previous prime is 81522226739. The next prime is 81522226787. The reversal of 81522226749 is 94762222518.

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 81522226749 - 2¹⁶ = 81522161213 is a prime.

It is a super-2 number, since 2×81522226749² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81522226698 and 81522226707.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81522226739) 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, 163699002 + ... + 163699499.

It is an arithmetic number, because the mean of its divisors is an integer number (13750737084).

Almost surely, 2^81522226749 is an apocalyptic number.

It is an amenable number.

81522226749 is a deficient number, since it is larger than the sum of its proper divisors (28483669923).

81522226749 is a wasteful number, since it uses less digits than its factorization.

81522226749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327398587.

The product of its digits is 967680, while the sum is 48.

The spelling of 81522226749 in words is "eighty-one billion, five hundred twenty-two million, two hundred twenty-six thousand, seven hundred forty-nine".