16003955646 has 64 divisors (see below), whose sum is σ = 41217500160. Its totient is φ = 4508148960.

The previous prime is 16003955633. The next prime is 16003955647. The reversal of 16003955646 is 64655930061.

16003955646 is a `hidden beast` number, since 1 + 60 + 0 + 39 + 556 + 4 + 6 = 666.

It is a super-2 number, since 2×16003955646² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16003955647) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 271321 + ... + 324996.

It is an arithmetic number, because the mean of its divisors is an integer number (644023440).

Almost surely, 2^16003955646 is an apocalyptic number.

16003955646 is an abundant number, since it is smaller than the sum of its proper divisors (25213544514).

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

16003955646 is a wasteful number, since it uses less digits than its factorization.

16003955646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 596406 (or 596400 counting only the distinct ones).

The product of its (nonzero) digits is 583200, while the sum is 45.

The spelling of 16003955646 in words is "sixteen billion, three million, nine hundred fifty-five thousand, six hundred forty-six".