71705391977 has 8 divisors (see below), whose sum is σ = 72791162496. Its totient is φ = 70620078672.

The previous prime is 71705391941. The next prime is 71705392009. The reversal of 71705391977 is 77919350717.

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 71705391977 - 2¹⁴ = 71705375593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71705391907) 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, 208583 + ... + 432339.

It is an arithmetic number, because the mean of its divisors is an integer number (9098895312).

Almost surely, 2^71705391977 is an apocalyptic number.

It is an amenable number.

71705391977 is a deficient number, since it is larger than the sum of its proper divisors (1085770519).

71705391977 is a wasteful number, since it uses less digits than its factorization.

71705391977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228607.

The product of its (nonzero) digits is 2917215, while the sum is 56.

The spelling of 71705391977 in words is "seventy-one billion, seven hundred five million, three hundred ninety-one thousand, nine hundred seventy-seven".