82661851 has 2 divisors, whose sum is σ = 82661852. Its totient is φ = 82661850.

The previous prime is 82661849. The next prime is 82661857. The reversal of 82661851 is 15816628.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 82661851 - 2¹ = 82661849 is a prime.

It is a super-2 number, since 2×82661851² = 13665963221492402, which contains 22 as substring.

Together with 82661849, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 82661851.

It is not a weakly prime, because it can be changed into another prime (82661857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41330925 + 41330926.

It is an arithmetic number, because the mean of its divisors is an integer number (41330926).

Almost surely, 2^82661851 is an apocalyptic number.

82661851 is a deficient number, since it is larger than the sum of its proper divisors (1).

82661851 is an equidigital number, since it uses as much as digits as its factorization.

82661851 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23040, while the sum is 37.

The square root of 82661851 is about 9091.8563011082. The cubic root of 82661851 is about 435.6138793890.

The spelling of 82661851 in words is "eighty-two million, six hundred sixty-one thousand, eight hundred fifty-one".