15639485993040 has 320 divisors, whose sum is σ = 59679496267776. Its totient is φ = 3299270731776.

The previous prime is 15639485993029. The next prime is 15639485993057. The reversal of 15639485993040 is 4039958493651.

It is a Cunningham number, because it is equal to 3954679²-1.

It is a super-3 number, since 3×15639485993040³ (a number of 41 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 158137687 + ... + 158236553.

Almost surely, 2^{15639485993040} is an apocalyptic number.

15639485993040 is a gapful number since it is divisible by the number (10) 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 15639485993040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29839748133888).

15639485993040 is an abundant number, since it is smaller than the sum of its proper divisors (44040010274736).

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

15639485993040 is a wasteful number, since it uses less digits than its factorization.

15639485993040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106146 (or 106140 counting only the distinct ones).

The product of its (nonzero) digits is 125971200, while the sum is 66.

The spelling of 15639485993040 in words is "fifteen trillion, six hundred thirty-nine billion, four hundred eighty-five million, nine hundred ninety-three thousand, forty".