67721573151 has 16 divisors (see below), whose sum is σ = 100625980000. Its totient is φ = 45013739904.

The previous prime is 67721573149. The next prime is 67721573177. The reversal of 67721573151 is 15137512776.

67721573151 is a `hidden beast` number, since 6 + 7 + 7 + 21 + 573 + 1 + 51 = 666.

It is not a de Polignac number, because 67721573151 - 2¹ = 67721573149 is a prime.

It is a super-2 number, since 2×67721573151² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 67721573097 and 67721573106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67721573351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3712276 + ... + 3730473.

It is an arithmetic number, because the mean of its divisors is an integer number (6289123750).

Almost surely, 2^67721573151 is an apocalyptic number.

67721573151 is a deficient number, since it is larger than the sum of its proper divisors (32904406849).

67721573151 is a wasteful number, since it uses less digits than its factorization.

67721573151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7443095 (or 7443089 counting only the distinct ones).

The product of its digits is 308700, while the sum is 45.

The spelling of 67721573151 in words is "sixty-seven billion, seven hundred twenty-one million, five hundred seventy-three thousand, one hundred fifty-one".