209809480964 has 6 divisors (see below), whose sum is σ = 367166591694. Its totient is φ = 104904740480.

The previous prime is 209809480957. The next prime is 209809480973. The reversal of 209809480964 is 469084908902.

It can be written as a sum of positive squares in only one way, i.e., 205680390400 + 4129090564 = 453520^2 + 64258^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26226185117 + ... + 26226185124.

It is an arithmetic number, because the mean of its divisors is an integer number (61194431949).

Almost surely, 2^209809480964 is an apocalyptic number.

It is an amenable number.

209809480964 is a deficient number, since it is larger than the sum of its proper divisors (157357110730).

209809480964 is a wasteful number, since it uses less digits than its factorization.

209809480964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52452370245 (or 52452370243 counting only the distinct ones).

The product of its (nonzero) digits is 8957952, while the sum is 59.

The spelling of 209809480964 in words is "two hundred nine billion, eight hundred nine million, four hundred eighty thousand, nine hundred sixty-four".