67542617521 has 8 divisors (see below), whose sum is σ = 69368418944. Its totient is φ = 65728409040.

The previous prime is 67542617509. The next prime is 67542617531. The reversal of 67542617521 is 12571624576.

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 67542617521 - 2¹⁹ = 67542093233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (67542617531) 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, 2886426 + ... + 2909731.

It is an arithmetic number, because the mean of its divisors is an integer number (8671052368).

Almost surely, 2^67542617521 is an apocalyptic number.

It is an amenable number.

67542617521 is a deficient number, since it is larger than the sum of its proper divisors (1825801423).

67542617521 is a wasteful number, since it uses less digits than its factorization.

67542617521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5796471.

The product of its digits is 705600, while the sum is 46.

The spelling of 67542617521 in words is "sixty-seven billion, five hundred forty-two million, six hundred seventeen thousand, five hundred twenty-one".