81676651 has 8 divisors (see below), whose sum is σ = 95515904. Its totient is φ = 68380200.

The previous prime is 81676627. The next prime is 81676667. The reversal of 81676651 is 15667618.

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

It is not a de Polignac number, because 81676651 - 2¹¹ = 81674603 is a prime.

It is a super-4 number, since 4×81676651⁴ (a number of 33 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81676681) 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, 135375 + ... + 135976.

It is an arithmetic number, because the mean of its divisors is an integer number (11939488).

Almost surely, 2^81676651 is an apocalyptic number.

81676651 is a deficient number, since it is larger than the sum of its proper divisors (13839253).

81676651 is a wasteful number, since it uses less digits than its factorization.

81676651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271401.

The product of its digits is 60480, while the sum is 40.

The square root of 81676651 is about 9037.5135407921. The cubic root of 81676651 is about 433.8763460219.

The spelling of 81676651 in words is "eighty-one million, six hundred seventy-six thousand, six hundred fifty-one".