81370351514 has 4 divisors (see below), whose sum is σ = 122055527274. Its totient is φ = 40685175756.

The previous prime is 81370351507. The next prime is 81370351571. The reversal of 81370351514 is 41515307318.

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

It can be written as a sum of positive squares in only one way, i.e., 78222580489 + 3147771025 = 279683^2 + 56105^2 .

It is a super-2 number, since 2×81370351514² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20342587877 + ... + 20342587880.

Almost surely, 2^81370351514 is an apocalyptic number.

81370351514 is a deficient number, since it is larger than the sum of its proper divisors (40685175760).

81370351514 is a wasteful number, since it uses less digits than its factorization.

81370351514 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40685175759.

The product of its (nonzero) digits is 50400, while the sum is 38.

The spelling of 81370351514 in words is "eighty-one billion, three hundred seventy million, three hundred fifty-one thousand, five hundred fourteen".