71056772409 has 16 divisors (see below), whose sum is σ = 108294837632. Its totient is φ = 40597175808.

The previous prime is 71056772377. The next prime is 71056772417. The reversal of 71056772409 is 90427765017.

It is a happy number.

It is not a de Polignac number, because 71056772409 - 2⁵ = 71056772377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71056772909) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 147064 + ... + 404649.

It is an arithmetic number, because the mean of its divisors is an integer number (6768427352).

Almost surely, 2^71056772409 is an apocalyptic number.

It is an amenable number.

71056772409 is a deficient number, since it is larger than the sum of its proper divisors (37238065223).

71056772409 is a wasteful number, since it uses less digits than its factorization.

71056772409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 557856.

The product of its (nonzero) digits is 740880, while the sum is 48.

The spelling of 71056772409 in words is "seventy-one billion, fifty-six million, seven hundred seventy-two thousand, four hundred nine".