67641653 has 6 divisors (see below), whose sum is σ = 71389494. Its totient is φ = 64081224.

The previous prime is 67641641. The next prime is 67641667. The reversal of 67641653 is 35614676.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 58629649 + 9012004 = 7657^2 + 3002^2 .

It is not a de Polignac number, because 67641653 - 2⁸ = 67641397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67641683) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 93326 + ... + 94047.

It is an arithmetic number, because the mean of its divisors is an integer number (11898249).

Almost surely, 2^67641653 is an apocalyptic number.

It is an amenable number.

67641653 is a deficient number, since it is larger than the sum of its proper divisors (3747841).

67641653 is a wasteful number, since it uses less digits than its factorization.

67641653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187411 (or 187392 counting only the distinct ones).

The product of its digits is 90720, while the sum is 38.

The square root of 67641653 is about 8224.4545715810. The cubic root of 67641653 is about 407.4472622983.

The spelling of 67641653 in words is "sixty-seven million, six hundred forty-one thousand, six hundred fifty-three".