163416621645 has 24 divisors (see below), whose sum is σ = 284440665600. Its totient is φ = 86790858336.

The previous prime is 163416621631. The next prime is 163416621647. The reversal of 163416621645 is 546126614361.

163416621645 is a `hidden beast` number, since 1 + 6 + 3 + 4 + 16 + 621 + 6 + 4 + 5 = 666.

It is not a de Polignac number, because 163416621645 - 2⁴ = 163416621629 is a prime.

It is a super-3 number, since 3×163416621645³ (a number of 35 digits) contains 333 as substring.

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 163416621645.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163416621647) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7586485 + ... + 7607994.

It is an arithmetic number, because the mean of its divisors is an integer number (11851694400).

Almost surely, 2^163416621645 is an apocalyptic number.

163416621645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

163416621645 is a deficient number, since it is larger than the sum of its proper divisors (121024043955).

163416621645 is a wasteful number, since it uses less digits than its factorization.

163416621645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15194729 (or 15194726 counting only the distinct ones).

The product of its digits is 622080, while the sum is 45.

The spelling of 163416621645 in words is "one hundred sixty-three billion, four hundred sixteen million, six hundred twenty-one thousand, six hundred forty-five".