16861334490 has 384 divisors, whose sum is σ = 60715008000. Its totient is φ = 3233468160.

The previous prime is 16861334489. The next prime is 16861334507. The reversal of 16861334490 is 9443316861.

16861334490 is a `hidden beast` number, since 168 + 61 + 3 + 344 + 90 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 3511111 + ... + 3515909.

It is an arithmetic number, because the mean of its divisors is an integer number (158112000).

Almost surely, 2^16861334490 is an apocalyptic number.

16861334490 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 16861334490, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30357504000).

16861334490 is an abundant number, since it is smaller than the sum of its proper divisors (43853673510).

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

16861334490 is a wasteful number, since it uses less digits than its factorization.

16861334490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4859 (or 4840 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 45.

The spelling of 16861334490 in words is "sixteen billion, eight hundred sixty-one million, three hundred thirty-four thousand, four hundred ninety".