8461670761649 has 6 divisors (see below), whose sum is σ = 9843168028914. Its totient is φ = 7252860652800.

The previous prime is 8461670761637. The next prime is 8461670761681. The reversal of 8461670761649 is 9461670761648.

It can be written as a sum of positive squares in only one way, i.e., 7725175536400 + 736495225249 = 2779420^2 + 858193^2 .

It is not a de Polignac number, because 8461670761649 - 2³² = 8457375794353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8461670763649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 86343579152 + ... + 86343579249.

It is an arithmetic number, because the mean of its divisors is an integer number (1640528004819).

Almost surely, 2^{8461670761649} is an apocalyptic number.

It is an amenable number.

8461670761649 is a deficient number, since it is larger than the sum of its proper divisors (1381497267265).

8461670761649 is a wasteful number, since it uses less digits than its factorization.

8461670761649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172687158415 (or 172687158408 counting only the distinct ones).

The product of its (nonzero) digits is 73156608, while the sum is 65.

Subtracting 8461670761649 from its reverse (9461670761648), we obtain a palindrome (999999999999).

The spelling of 8461670761649 in words is "eight trillion, four hundred sixty-one billion, six hundred seventy million, seven hundred sixty-one thousand, six hundred forty-nine".