9861548739840 has 1152 divisors, whose sum is σ = 41750651120640. Its totient is φ = 2157074841600.

The previous prime is 9861548739769. The next prime is 9861548739859. The reversal of 9861548739840 is 489378451689.

9861548739840 is a `hidden beast` number, since 9 + 8 + 6 + 1 + 548 + 7 + 39 + 8 + 40 = 666.

It is a tau number, because it is divible by the number of its divisors (1152).

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 546004410 + ... + 546022470.

Almost surely, 2^{9861548739840} is an apocalyptic number.

9861548739840 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9861548739840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20875325560320).

9861548739840 is an abundant number, since it is smaller than the sum of its proper divisors (31889102380800).

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

9861548739840 is a wasteful number, since it uses less digits than its factorization.

9861548739840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18196 (or 18176 counting only the distinct ones).

The product of its (nonzero) digits is 418037760, while the sum is 72.

The spelling of 9861548739840 in words is "nine trillion, eight hundred sixty-one billion, five hundred forty-eight million, seven hundred thirty-nine thousand, eight hundred forty".