126321665 has 12 divisors (see below), whose sum is σ = 154893396. Its totient is φ = 98898528.

The previous prime is 126321661. The next prime is 126321703. The reversal of 126321665 is 566123621.

It can be written as a sum of positive squares in 2 ways, for example, as 41460721 + 84860944 = 6439^2 + 9212^2 .

It is not a de Polignac number, because 126321665 - 2² = 126321661 is a prime.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126321661) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5327 + ... + 16763.

It is an arithmetic number, because the mean of its divisors is an integer number (12907783).

Almost surely, 2^126321665 is an apocalyptic number.

It is an amenable number.

126321665 is a deficient number, since it is larger than the sum of its proper divisors (28571731).

126321665 is an equidigital number, since it uses as much as digits as its factorization.

126321665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11536 (or 11489 counting only the distinct ones).

The product of its digits is 12960, while the sum is 32.

The square root of 126321665 is about 11239.2911253335. The cubic root of 126321665 is about 501.7560453890.

The spelling of 126321665 in words is "one hundred twenty-six million, three hundred twenty-one thousand, six hundred sixty-five".