7911320667849 has 45 divisors (see below), whose sum is σ = 12024118272727. Its totient is φ = 5183841502656.

The previous prime is 7911320667829. The next prime is 7911320667863. The reversal of 7911320667849 is 9487660231197.

The square root of 7911320667849 is 2812707.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 6455842497225 + 1455478170624 = 2540835^2 + 1206432^2 .

It is a de Polignac number, because none of the positive numbers 2^k-7911320667849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7911320667829) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 1493544769 + ... + 1493550065.

Almost surely, 2^{7911320667849} is an apocalyptic number.

7911320667849 is the 2812707-th square number.

7911320667849 is the 1406354-th centered octagonal number.

It is an amenable number.

7911320667849 is a deficient number, since it is larger than the sum of its proper divisors (4112797604878).

7911320667849 is an frugal number, since it uses more digits than its factorization.

7911320667849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10724 (or 5359 counting only the distinct ones).

The product of its (nonzero) digits is 27433728, while the sum is 63.

The spelling of 7911320667849 in words is "seven trillion, nine hundred eleven billion, three hundred twenty million, six hundred sixty-seven thousand, eight hundred forty-nine".