67633661 has 4 divisors (see below), whose sum is σ = 69815424. Its totient is φ = 65451900.

The previous prime is 67633649. The next prime is 67633663. The reversal of 67633661 is 16633676.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 67633661 - 2¹⁰ = 67632637 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 (67633663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1090835 + ... + 1090896.

It is an arithmetic number, because the mean of its divisors is an integer number (17453856).

Almost surely, 2^67633661 is an apocalyptic number.

It is an amenable number.

67633661 is a deficient number, since it is larger than the sum of its proper divisors (2181763).

67633661 is a wasteful number, since it uses less digits than its factorization.

67633661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2181762.

The product of its digits is 81648, while the sum is 38.

The square root of 67633661 is about 8223.9686891427. The cubic root of 67633661 is about 407.4312147564.

The spelling of 67633661 in words is "sixty-seven million, six hundred thirty-three thousand, six hundred sixty-one".