67545561 has 16 divisors (see below), whose sum is σ = 92666816. Its totient is φ = 43739136.

The previous prime is 67545557. The next prime is 67545563. The reversal of 67545561 is 16554576.

67545561 = T₃₈₈ + T₃₈₉ + ... + T₇₇₃.

It is not a de Polignac number, because 67545561 - 2² = 67545557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (67545563) 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, 23541 + ... + 26253.

It is an arithmetic number, because the mean of its divisors is an integer number (5791676).

Almost surely, 2^67545561 is an apocalyptic number.

It is an amenable number.

67545561 is a deficient number, since it is larger than the sum of its proper divisors (25121255).

67545561 is a wasteful number, since it uses less digits than its factorization.

67545561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2952.

The product of its digits is 126000, while the sum is 39.

The square root of 67545561 is about 8218.6106490087. The cubic root of 67545561 is about 407.2542304643.

The spelling of 67545561 in words is "sixty-seven million, five hundred forty-five thousand, five hundred sixty-one".