102159029905 has 4 divisors (see below), whose sum is σ = 122590835892. Its totient is φ = 81727223920.

The previous prime is 102159029897. The next prime is 102159029909. The reversal of 102159029905 is 509920951201.

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 15574790401 + 86584239504 = 124799^2 + 294252^2 .

It is not a de Polignac number, because 102159029905 - 2³ = 102159029897 is a prime.

It is a super-2 number, since 2×102159029905² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (102159029909) 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, 10215902986 + ... + 10215902995.

It is an arithmetic number, because the mean of its divisors is an integer number (30647708973).

Almost surely, 2^102159029905 is an apocalyptic number.

It is an amenable number.

102159029905 is a deficient number, since it is larger than the sum of its proper divisors (20431805987).

102159029905 is an equidigital number, since it uses as much as digits as its factorization.

102159029905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20431805986.

The product of its (nonzero) digits is 72900, while the sum is 43.

The spelling of 102159029905 in words is "one hundred two billion, one hundred fifty-nine million, twenty-nine thousand, nine hundred five".