84000661 has 2 divisors, whose sum is σ = 84000662. Its totient is φ = 84000660.

The previous prime is 84000643. The next prime is 84000743. The reversal of 84000661 is 16600048.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79548561 + 4452100 = 8919^2 + 2110^2 .

It is a cyclic number.

It is not a de Polignac number, because 84000661 - 2⁷ = 84000533 is a prime.

It is a super-2 number, since 2×84000661² = 14112222096873842, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84000611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42000330 + 42000331.

It is an arithmetic number, because the mean of its divisors is an integer number (42000331).

Almost surely, 2^84000661 is an apocalyptic number.

It is an amenable number.

84000661 is a deficient number, since it is larger than the sum of its proper divisors (1).

84000661 is an equidigital number, since it uses as much as digits as its factorization.

84000661 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 84000661 is about 9165.1874503471. The cubic root of 84000661 is about 437.9530627406.

The spelling of 84000661 in words is "eighty-four million, six hundred sixty-one", and thus it is an aban number.