81626409122426 has 32 divisors (see below), whose sum is σ = 144025253460480. Its totient is φ = 33973698844800.

The previous prime is 81626409122417. The next prime is 81626409122429. The reversal of 81626409122426 is 62422190462618.

It is a super-3 number, since 3×81626409122426³ (a number of 43 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (81626409122429) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 604877315 + ... + 605012246.

It is an arithmetic number, because the mean of its divisors is an integer number (4500789170640).

Almost surely, 2^{81626409122426} is an apocalyptic number.

81626409122426 is a deficient number, since it is larger than the sum of its proper divisors (62398844338054).

81626409122426 is a wasteful number, since it uses less digits than its factorization.

81626409122426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1209889710.

The product of its (nonzero) digits is 3981312, while the sum is 53.

The spelling of 81626409122426 in words is "eighty-one trillion, six hundred twenty-six billion, four hundred nine million, one hundred twenty-two thousand, four hundred twenty-six".