7661998917888 has 144 divisors (see below), whose sum is σ = 23459588576256. Its totient is φ = 2174644684800.

The previous prime is 7661998917887. The next prime is 7661998917899. The reversal of 7661998917888 is 8887198991667.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (7661998917887) 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, 3907506 + ... + 5531057.

Almost surely, 2^{7661998917888} is an apocalyptic number.

It is an amenable number.

7661998917888 is an abundant number, since it is smaller than the sum of its proper divisors (15797589658368).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7661998917888 is a wasteful number, since it uses less digits than its factorization.

7661998917888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9438740 (or 9438726 counting only the distinct ones).

The product of its digits is 5267275776, while the sum is 87.

The spelling of 7661998917888 in words is "seven trillion, six hundred sixty-one billion, nine hundred ninety-eight million, nine hundred seventeen thousand, eight hundred eighty-eight".