209694531057 has 8 divisors (see below), whose sum is σ = 305010227040. Its totient is φ = 127087594560.

The previous prime is 209694531047. The next prime is 209694531061. The reversal of 209694531057 is 750135496902.

209694531057 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 209694531057 - 2⁶ = 209694530993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (209694531047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3177189832 + ... + 3177189897.

It is an arithmetic number, because the mean of its divisors is an integer number (38126278380).

Almost surely, 2^209694531057 is an apocalyptic number.

It is an amenable number.

209694531057 is a deficient number, since it is larger than the sum of its proper divisors (95315695983).

209694531057 is a wasteful number, since it uses less digits than its factorization.

209694531057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6354379743.

The product of its (nonzero) digits is 2041200, while the sum is 51.

The spelling of 209694531057 in words is "two hundred nine billion, six hundred ninety-four million, five hundred thirty-one thousand, fifty-seven".