7945509580891 has 4 divisors (see below), whose sum is σ = 8412892497432. Its totient is φ = 7478126664352.

The previous prime is 7945509580843. The next prime is 7945509580973. The reversal of 7945509580891 is 1980859055497.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 7945509580891 - 2²³ = 7945501192283 is a prime.

It is a super-2 number, since 2×7945509580891² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7945509580891.

It is not an unprimeable number, because it can be changed into a prime (7945509586891) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 233691458245 + ... + 233691458278.

It is an arithmetic number, because the mean of its divisors is an integer number (2103223124358).

Almost surely, 2^{7945509580891} is an apocalyptic number.

7945509580891 is a deficient number, since it is larger than the sum of its proper divisors (467382916541).

7945509580891 is a wasteful number, since it uses less digits than its factorization.

7945509580891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 467382916540.

The product of its (nonzero) digits is 163296000, while the sum is 70.

It can be divided in two parts, 7945509 and 580891, that added together give a square (8526400 = 2920²).

The spelling of 7945509580891 in words is "seven trillion, nine hundred forty-five billion, five hundred nine million, five hundred eighty thousand, eight hundred ninety-one".