82661057 has 4 divisors (see below), whose sum is σ = 86255040. Its totient is φ = 79067076.

The previous prime is 82661053. The next prime is 82661063. The reversal of 82661057 is 75016628.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 82661057 - 2² = 82661053 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82661053) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1796957 + ... + 1797002.

It is an arithmetic number, because the mean of its divisors is an integer number (21563760).

Almost surely, 2^82661057 is an apocalyptic number.

It is an amenable number.

82661057 is a deficient number, since it is larger than the sum of its proper divisors (3593983).

82661057 is a wasteful number, since it uses less digits than its factorization.

82661057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3593982.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 82661057 is about 9091.8126355529. The cubic root of 82661057 is about 435.6124846363.

The spelling of 82661057 in words is "eighty-two million, six hundred sixty-one thousand, fifty-seven".