781946949649187 has 16 divisors (see below), whose sum is σ = 893894198246400. Its totient is φ = 670059843412608.

The previous prime is 781946949649183. The next prime is 781946949649189.

781946949649187 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 781946949649187 - 2² = 781946949649183 is a prime.

It is a super-2 number, since 2×781946949649187² (a number of 31 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 781946949649096 and 781946949649105.

It is not an unprimeable number, because it can be changed into a prime (781946949649181) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1488595814 + ... + 1489121012.

It is an arithmetic number, because the mean of its divisors is an integer number (55868387390400).

Almost surely, 2^{781946949649187} is an apocalyptic number.

781946949649187 is a deficient number, since it is larger than the sum of its proper divisors (111947248597213).

781946949649187 is a wasteful number, since it uses less digits than its factorization.

781946949649187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 582050.

The product of its digits is 47405481984, while the sum is 92.

The spelling of 781946949649187 in words is "seven hundred eighty-one trillion, nine hundred forty-six billion, nine hundred forty-nine million, six hundred forty-nine thousand, one hundred eighty-seven".