16240215645 has 24 divisors (see below), whose sum is σ = 28253601792. Its totient is φ = 8629480800.

The previous prime is 16240215577. The next prime is 16240215653. The reversal of 16240215645 is 54651204261.

16240215645 is a `hidden beast` number, since 1 + 6 + 2 + 4 + 0 + 2 + 1 + 5 + 645 = 666.

It is not a de Polignac number, because 16240215645 - 2⁷ = 16240215517 is a prime.

It is a super-2 number, since 2×16240215645² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 653661 + ... + 678050.

It is an arithmetic number, because the mean of its divisors is an integer number (1177233408).

Almost surely, 2^16240215645 is an apocalyptic number.

16240215645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16240215645 is a deficient number, since it is larger than the sum of its proper divisors (12013386147).

16240215645 is a wasteful number, since it uses less digits than its factorization.

16240215645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1331993 (or 1331990 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 36.

The spelling of 16240215645 in words is "sixteen billion, two hundred forty million, two hundred fifteen thousand, six hundred forty-five".