7661141678989 has 4 divisors (see below), whose sum is σ = 7664234592924. Its totient is φ = 7658048765056.

The previous prime is 7661141678987. The next prime is 7661141678999. The reversal of 7661141678989 is 9898761411667.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1267617033225 + 6393524645764 = 1125885^2 + 2528542^2 .

It is a cyclic number.

It is not a de Polignac number, because 7661141678989 - 2¹ = 7661141678987 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7661141678987) 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, 1546453252 + ... + 1546458205.

It is an arithmetic number, because the mean of its divisors is an integer number (1916058648231).

Almost surely, 2^{7661141678989} is an apocalyptic number.

It is an amenable number.

7661141678989 is a deficient number, since it is larger than the sum of its proper divisors (3092913935).

7661141678989 is a wasteful number, since it uses less digits than its factorization.

7661141678989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3092913934.

The product of its digits is 219469824, while the sum is 73.

The spelling of 7661141678989 in words is "seven trillion, six hundred sixty-one billion, one hundred forty-one million, six hundred seventy-eight thousand, nine hundred eighty-nine".