9889855258778 has 16 divisors (see below), whose sum is σ = 16741447774560. Its totient is φ = 4340375348400.

The previous prime is 9889855258757. The next prime is 9889855258793. The reversal of 9889855258778 is 8778525589889.

9889855258778 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×9889855258778² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 9889855258693 and 9889855258702.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7750669628 + ... + 7750670903.

It is an arithmetic number, because the mean of its divisors is an integer number (1046340485910).

Almost surely, 2^{9889855258778} is an apocalyptic number.

9889855258778 is a deficient number, since it is larger than the sum of its proper divisors (6851592515782).

9889855258778 is a wasteful number, since it uses less digits than its factorization.

9889855258778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15501340573.

The product of its digits is 32514048000, while the sum is 89.

The spelling of 9889855258778 in words is "nine trillion, eight hundred eighty-nine billion, eight hundred fifty-five million, two hundred fifty-eight thousand, seven hundred seventy-eight".