209095912542 has 64 divisors (see below), whose sum is σ = 457870786560. Its totient is φ = 63131971200.

The previous prime is 209095912481. The next prime is 209095912561. The reversal of 209095912542 is 245219590902.

It is a super-2 number, since 2×209095912542² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 209095912491 and 209095912500.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 30252067 + ... + 30258977.

It is an arithmetic number, because the mean of its divisors is an integer number (7154231040).

Almost surely, 2^209095912542 is an apocalyptic number.

209095912542 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

209095912542 is an abundant number, since it is smaller than the sum of its proper divisors (248774874018).

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

209095912542 is a wasteful number, since it uses less digits than its factorization.

209095912542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8529.

The product of its (nonzero) digits is 583200, while the sum is 48.

The spelling of 209095912542 in words is "two hundred nine billion, ninety-five million, nine hundred twelve thousand, five hundred forty-two".