16207629985 has 4 divisors (see below), whose sum is σ = 19449155988. Its totient is φ = 12966103984.

The previous prime is 16207629979. The next prime is 16207629989. The reversal of 16207629985 is 58992670261.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3654444304 + 12553185681 = 60452^2 + 112041^2 .

It is a cyclic number.

It is not a de Polignac number, because 16207629985 - 2⁵ = 16207629953 is a prime.

It is a super-2 number, since 2×16207629985² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16207629989) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1620762994 + ... + 1620763003.

It is an arithmetic number, because the mean of its divisors is an integer number (4862288997).

Almost surely, 2^16207629985 is an apocalyptic number.

It is an amenable number.

16207629985 is a deficient number, since it is larger than the sum of its proper divisors (3241526003).

16207629985 is an equidigital number, since it uses as much as digits as its factorization.

16207629985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3241526002.

The product of its (nonzero) digits is 3265920, while the sum is 55.

The spelling of 16207629985 in words is "sixteen billion, two hundred seven million, six hundred twenty-nine thousand, nine hundred eighty-five".