67197661 has 16 divisors (see below), whose sum is σ = 73884160. Its totient is φ = 60886080.

The previous prime is 67197653. The next prime is 67197667. The reversal of 67197661 is 16679176.

It is a cyclic number.

It is not a de Polignac number, because 67197661 - 2³ = 67197653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67197667) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42100 + ... + 43666.

It is an arithmetic number, because the mean of its divisors is an integer number (4617760).

Almost surely, 2^67197661 is an apocalyptic number.

67197661 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

67197661 is a deficient number, since it is larger than the sum of its proper divisors (6686499).

67197661 is a wasteful number, since it uses less digits than its factorization.

67197661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1684.

The product of its digits is 95256, while the sum is 43.

The square root of 67197661 is about 8197.4179471343. The cubic root of 67197661 is about 406.5538257048.

The spelling of 67197661 in words is "sixty-seven million, one hundred ninety-seven thousand, six hundred sixty-one".