71551783378 has 16 divisors (see below), whose sum is σ = 113825284344. Its totient is φ = 33616844800.

The previous prime is 71551783349. The next prime is 71551783379. The reversal of 71551783378 is 87338715517.

It can be written as a sum of positive squares in 4 ways, for example, as 37338992289 + 34212791089 = 193233^2 + 184967^2 .

It is not an unprimeable number, because it can be changed into a prime (71551783379) 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, 1684423 + ... + 1726378.

Almost surely, 2^71551783378 is an apocalyptic number.

71551783378 is a deficient number, since it is larger than the sum of its proper divisors (42273500966).

71551783378 is a wasteful number, since it uses less digits than its factorization.

71551783378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3411437.

The product of its digits is 4939200, while the sum is 55.

The spelling of 71551783378 in words is "seventy-one billion, five hundred fifty-one million, seven hundred eighty-three thousand, three hundred seventy-eight".