67543747621 has 32 divisors (see below), whose sum is σ = 79449478400. Its totient is φ = 57395677248.

The previous prime is 67543747559. The next prime is 67543747631. The reversal of 67543747621 is 12674734576.

It is not a de Polignac number, because 67543747621 - 2²¹ = 67541650469 is a prime.

It is a hoax number, since the sum of its digits (52) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67543747631) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29455351 + ... + 29457643.

It is an arithmetic number, because the mean of its divisors is an integer number (2482796200).

Almost surely, 2^67543747621 is an apocalyptic number.

It is an amenable number.

67543747621 is a deficient number, since it is larger than the sum of its proper divisors (11905730779).

67543747621 is a wasteful number, since it uses less digits than its factorization.

67543747621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3018 (or 3004 counting only the distinct ones).

The product of its digits is 5927040, while the sum is 52.

The spelling of 67543747621 in words is "sixty-seven billion, five hundred forty-three million, seven hundred forty-seven thousand, six hundred twenty-one".