67221561 has 8 divisors (see below), whose sum is σ = 97776864. Its totient is φ = 40740320.

The previous prime is 67221559. The next prime is 67221607. The reversal of 67221561 is 16512276.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 67221561 - 2¹ = 67221559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (67221521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1018476 + ... + 1018541.

It is an arithmetic number, because the mean of its divisors is an integer number (12222108).

Almost surely, 2^67221561 is an apocalyptic number.

It is an amenable number.

67221561 is a deficient number, since it is larger than the sum of its proper divisors (30555303).

67221561 is a wasteful number, since it uses less digits than its factorization.

67221561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2037031.

The product of its digits is 5040, while the sum is 30.

The square root of 67221561 is about 8198.8755936409. The cubic root of 67221561 is about 406.6020192706.

It can be divided in two parts, 672215 and 61, that added together give a palindrome (672276).

The spelling of 67221561 in words is "sixty-seven million, two hundred twenty-one thousand, five hundred sixty-one".