81652366 has 4 divisors (see below), whose sum is σ = 122478552. Its totient is φ = 40826182.

The previous prime is 81652349. The next prime is 81652381. The reversal of 81652366 is 66325618.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20413090 + ... + 20413093.

It is an arithmetic number, because the mean of its divisors is an integer number (30619638).

Almost surely, 2^81652366 is an apocalyptic number.

81652366 is a deficient number, since it is larger than the sum of its proper divisors (40826186).

81652366 is a wasteful number, since it uses less digits than its factorization.

81652366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40826185.

The product of its digits is 51840, while the sum is 37.

The square root of 81652366 is about 9036.1698744546. The cubic root of 81652366 is about 433.8333401306.

The spelling of 81652366 in words is "eighty-one million, six hundred fifty-two thousand, three hundred sixty-six".