209979479512 has 32 divisors (see below), whose sum is σ = 429559750800. Its totient is φ = 95432713600.

The previous prime is 209979479491. The next prime is 209979479519. The reversal of 209979479512 is 215974979902.

It is a super-2 number, since 2×209979479512² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209979479519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 536562 + ... + 841342.

Almost surely, 2^209979479512 is an apocalyptic number.

209979479512 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

209979479512 is an abundant number, since it is smaller than the sum of its proper divisors (219580271288).

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

209979479512 is a wasteful number, since it uses less digits than its factorization.

209979479512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312627 (or 312623 counting only the distinct ones).

The product of its (nonzero) digits is 25719120, while the sum is 64.

The spelling of 209979479512 in words is "two hundred nine billion, nine hundred seventy-nine million, four hundred seventy-nine thousand, five hundred twelve".