684735609157 has 4 divisors (see below), whose sum is σ = 684774534400. Its totient is φ = 684696683916.

The previous prime is 684735609133. The next prime is 684735609163. The reversal of 684735609157 is 751906537486.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 684735609157 - 2³⁵ = 650375870789 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 684735609095 and 684735609104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684735669157) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19436223 + ... + 19471420.

It is an arithmetic number, because the mean of its divisors is an integer number (171193633600).

Almost surely, 2^684735609157 is an apocalyptic number.

It is an amenable number.

684735609157 is a deficient number, since it is larger than the sum of its proper divisors (38925243).

684735609157 is a wasteful number, since it uses less digits than its factorization.

684735609157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38925242.

The product of its (nonzero) digits is 38102400, while the sum is 61.

The spelling of 684735609157 in words is "six hundred eighty-four billion, seven hundred thirty-five million, six hundred nine thousand, one hundred fifty-seven".