781649549432706 has 16 divisors (see below), whose sum is σ = 1569527382130848. Its totient is φ = 259511802600000.

The previous prime is 781649549432669. The next prime is 781649549432723. The reversal of 781649549432706 is 607234945946187.

It is a super-2 number, since 2×781649549432706² (a number of 31 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 259511801095 + ... + 259511804106.

It is an arithmetic number, because the mean of its divisors is an integer number (98095461383178).

It is a 1-persistent number, because it is pandigital, but 2⋅781649549432706 = 1563299098865412 is not.

Almost surely, 2^{781649549432706} is an apocalyptic number.

781649549432706 is an abundant number, since it is smaller than the sum of its proper divisors (787877832698142).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

781649549432706 is a wasteful number, since it uses less digits than its factorization.

781649549432706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 519023605457.

The product of its (nonzero) digits is 2194698240, while the sum is 75.

The spelling of 781649549432706 in words is "seven hundred eighty-one trillion, six hundred forty-nine billion, five hundred forty-nine million, four hundred thirty-two thousand, seven hundred six".