781456689106 has 4 divisors (see below), whose sum is σ = 1172185033662. Its totient is φ = 390728344552.

The previous prime is 781456689089. The next prime is 781456689133. The reversal of 781456689106 is 601986654187.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 601986654187 = 4241 ⋅141944507.

It can be written as a sum of positive squares in only one way, i.e., 751177557025 + 30279132081 = 866705^2 + 174009^2 .

It is a super-2 number, since 2×781456689106² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195364172275 + ... + 195364172278.

Almost surely, 2^781456689106 is an apocalyptic number.

781456689106 is a deficient number, since it is larger than the sum of its proper divisors (390728344556).

781456689106 is a wasteful number, since it uses less digits than its factorization.

781456689106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 390728344555.

The product of its (nonzero) digits is 17418240, while the sum is 61.

The spelling of 781456689106 in words is "seven hundred eighty-one billion, four hundred fifty-six million, six hundred eighty-nine thousand, one hundred six".