209157946658 has 16 divisors (see below), whose sum is σ = 330800760000. Its totient is φ = 98909405712.

The previous prime is 209157946597. The next prime is 209157946667. The reversal of 209157946658 is 856649751902.

It is a self number, because there is not a number n which added to its sum of digits gives 209157946658.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4571693 + ... + 4617216.

It is an arithmetic number, because the mean of its divisors is an integer number (20675047500).

Almost surely, 2^209157946658 is an apocalyptic number.

209157946658 is a deficient number, since it is larger than the sum of its proper divisors (121642813342).

209157946658 is a wasteful number, since it uses less digits than its factorization.

209157946658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9189529.

The product of its (nonzero) digits is 32659200, while the sum is 62.

The spelling of 209157946658 in words is "two hundred nine billion, one hundred fifty-seven million, nine hundred forty-six thousand, six hundred fifty-eight".