67206615561 has 24 divisors (see below), whose sum is σ = 98793240000. Its totient is φ = 44013043872.

The previous prime is 67206615493. The next prime is 67206615611. The reversal of 67206615561 is 16551660276.

67206615561 is a `hidden beast` number, since 6 + 7 + 20 + 6 + 61 + 5 + 561 = 666.

67206615561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 67206615561 - 2⁷ = 67206615433 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (67206615061) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 697635 + ... + 788103.

It is an arithmetic number, because the mean of its divisors is an integer number (4116385000).

Almost surely, 2^67206615561 is an apocalyptic number.

It is an amenable number.

67206615561 is a deficient number, since it is larger than the sum of its proper divisors (31586624439).

67206615561 is a wasteful number, since it uses less digits than its factorization.

67206615561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91933 (or 91930 counting only the distinct ones).

The product of its (nonzero) digits is 453600, while the sum is 45.

The spelling of 67206615561 in words is "sixty-seven billion, two hundred six million, six hundred fifteen thousand, five hundred sixty-one".