662020081 has 2 divisors, whose sum is σ = 662020082. Its totient is φ = 662020080.

The previous prime is 662020067. The next prime is 662020141. The reversal of 662020081 is 180020266.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 491952400 + 170067681 = 22180^2 + 13041^2 .

It is a cyclic number.

It is not a de Polignac number, because 662020081 - 2⁵ = 662020049 is a prime.

It is a super-2 number, since 2×662020081² = 876541175294493122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (662030081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331010040 + 331010041.

It is an arithmetic number, because the mean of its divisors is an integer number (331010041).

Almost surely, 2^662020081 is an apocalyptic number.

It is an amenable number.

662020081 is a deficient number, since it is larger than the sum of its proper divisors (1).

662020081 is an equidigital number, since it uses as much as digits as its factorization.

662020081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 662020081 is about 25729.7508926923. The cubic root of 662020081 is about 871.5461478433.

The spelling of 662020081 in words is "six hundred sixty-two million, twenty thousand, eighty-one".