16256439990 has 192 divisors, whose sum is σ = 51711528960. Its totient is φ = 3595777920.

The previous prime is 16256439989. The next prime is 16256440001. The reversal of 16256439990 is 9993465261.

16256439990 is a `hidden beast` number, since 1 + 625 + 6 + 4 + 3 + 9 + 9 + 9 + 0 = 666.

It is a super-2 number, since 2×16256439990² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 511896 + ... + 542724.

It is an arithmetic number, because the mean of its divisors is an integer number (269330880).

Almost surely, 2^16256439990 is an apocalyptic number.

16256439990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 16256439990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25855764480).

16256439990 is an abundant number, since it is smaller than the sum of its proper divisors (35455088970).

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

16256439990 is a wasteful number, since it uses less digits than its factorization.

16256439990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30889 (or 30877 counting only the distinct ones).

The product of its (nonzero) digits is 3149280, while the sum is 54.

The spelling of 16256439990 in words is "sixteen billion, two hundred fifty-six million, four hundred thirty-nine thousand, nine hundred ninety".