67615561 has 16 divisors (see below), whose sum is σ = 76769280. Its totient is φ = 59083200.

The previous prime is 67615553. The next prime is 67615573. The reversal of 67615561 is 16551676.

It is a cyclic number.

It is not a de Polignac number, because 67615561 - 2³ = 67615553 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 67615561.

It is not an unprimeable number, because it can be changed into a prime (67613561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29080 + ... + 31318.

It is an arithmetic number, because the mean of its divisors is an integer number (4798080).

Almost surely, 2^67615561 is an apocalyptic number.

It is an amenable number.

67615561 is a deficient number, since it is larger than the sum of its proper divisors (9153719).

67615561 is a wasteful number, since it uses less digits than its factorization.

67615561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2376.

The product of its digits is 37800, while the sum is 37.

The square root of 67615561 is about 8222.8681735754. The cubic root of 67615561 is about 407.3948661748.

The spelling of 67615561 in words is "sixty-seven million, six hundred fifteen thousand, five hundred sixty-one".