209640749594 has 32 divisors (see below), whose sum is σ = 322050784896. Its totient is φ = 102320850240.

The previous prime is 209640749587. The next prime is 209640749641. The reversal of 209640749594 is 495947046902.

It is a super-2 number, since 2×209640749594² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42495152 + ... + 42500084.

It is an arithmetic number, because the mean of its divisors is an integer number (10064087028).

Almost surely, 2^209640749594 is an apocalyptic number.

209640749594 is a deficient number, since it is larger than the sum of its proper divisors (112410035302).

209640749594 is a wasteful number, since it uses less digits than its factorization.

209640749594 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7910.

The product of its (nonzero) digits is 19595520, while the sum is 59.

The spelling of 209640749594 in words is "two hundred nine billion, six hundred forty million, seven hundred forty-nine thousand, five hundred ninety-four".