81626867726 has 8 divisors (see below), whose sum is σ = 122442145344. Its totient is φ = 40812819280.

The previous prime is 81626867719. The next prime is 81626867731. The reversal of 81626867726 is 62776862618.

It is a happy number.

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

It is a super-2 number, since 2×81626867726² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 117935 + ... + 420906.

It is an arithmetic number, because the mean of its divisors is an integer number (15305268168).

Almost surely, 2^81626867726 is an apocalyptic number.

81626867726 is a deficient number, since it is larger than the sum of its proper divisors (40815277618).

81626867726 is a wasteful number, since it uses less digits than its factorization.

81626867726 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 614586.

The product of its digits is 16257024, while the sum is 59.

The spelling of 81626867726 in words is "eighty-one billion, six hundred twenty-six million, eight hundred sixty-seven thousand, seven hundred twenty-six".