67705020391 has 4 divisors (see below), whose sum is σ = 67709850912. Its totient is φ = 67700189872.

The previous prime is 67705020347. The next prime is 67705020521. The reversal of 67705020391 is 19302050776.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 67705020391 - 2¹⁷ = 67704889319 is a prime.

It is a super-2 number, since 2×67705020391² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67705020191) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2394175 + ... + 2422288.

It is an arithmetic number, because the mean of its divisors is an integer number (16927462728).

Almost surely, 2^67705020391 is an apocalyptic number.

67705020391 is a deficient number, since it is larger than the sum of its proper divisors (4830521).

67705020391 is a wasteful number, since it uses less digits than its factorization.

67705020391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4830520.

The product of its (nonzero) digits is 79380, while the sum is 40.

The spelling of 67705020391 in words is "sixty-seven billion, seven hundred five million, twenty thousand, three hundred ninety-one".