71654642067 has 4 divisors (see below), whose sum is σ = 95539522760. Its totient is φ = 47769761376.

The previous prime is 71654642063. The next prime is 71654642117. The reversal of 71654642067 is 76024645617.

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

It is not a de Polignac number, because 71654642067 - 2² = 71654642063 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71654642063) 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, 11942440342 + ... + 11942440347.

It is an arithmetic number, because the mean of its divisors is an integer number (23884880690).

Almost surely, 2^71654642067 is an apocalyptic number.

71654642067 is a deficient number, since it is larger than the sum of its proper divisors (23884880693).

71654642067 is a wasteful number, since it uses less digits than its factorization.

71654642067 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23884880692.

The product of its (nonzero) digits is 1693440, while the sum is 48.

The spelling of 71654642067 in words is "seventy-one billion, six hundred fifty-four million, six hundred forty-two thousand, sixty-seven".