81385707274 has 8 divisors (see below), whose sum is σ = 123158902500. Its totient is φ = 40332739776.

The previous prime is 81385707269. The next prime is 81385707287. The reversal of 81385707274 is 47270758318.

It can be written as a sum of positive squares in 2 ways, for example, as 80850941649 + 534765625 = 284343^2 + 23125^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×81385707274² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 180056649 + ... + 180057100.

Almost surely, 2^81385707274 is an apocalyptic number.

81385707274 is a deficient number, since it is larger than the sum of its proper divisors (41773195226).

81385707274 is a wasteful number, since it uses less digits than its factorization.

81385707274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360113864.

The product of its (nonzero) digits is 2634240, while the sum is 52.

The spelling of 81385707274 in words is "eighty-one billion, three hundred eighty-five million, seven hundred seven thousand, two hundred seventy-four".