16145621646 has 128 divisors (see below), whose sum is σ = 42152140800. Its totient is φ = 3999999360.

The previous prime is 16145621567. The next prime is 16145621669. The reversal of 16145621646 is 64612654161.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 16145621598 and 16145621607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1104775 + ... + 1119293.

It is an arithmetic number, because the mean of its divisors is an integer number (329313600).

Almost surely, 2^16145621646 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16145621646, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21076070400).

16145621646 is an abundant number, since it is smaller than the sum of its proper divisors (26006519154).

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

16145621646 is a wasteful number, since it uses less digits than its factorization.

16145621646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14654.

The product of its digits is 207360, while the sum is 42.

The spelling of 16145621646 in words is "sixteen billion, one hundred forty-five million, six hundred twenty-one thousand, six hundred forty-six".