1685020501672 has 8 divisors (see below), whose sum is σ = 3159413440650. Its totient is φ = 842510250832.

The previous prime is 1685020501667. The next prime is 1685020501729. The reversal of 1685020501672 is 2761050205861.

It can be written as a sum of positive squares in only one way, i.e., 1531539902916 + 153480598756 = 1237554^2 + 391766^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105313781347 + ... + 105313781362.

Almost surely, 2^{1685020501672} is an apocalyptic number.

It is an amenable number.

1685020501672 is a deficient number, since it is larger than the sum of its proper divisors (1474392938978).

1685020501672 is a wasteful number, since it uses less digits than its factorization.

1685020501672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210627562715 (or 210627562711 counting only the distinct ones).

The product of its (nonzero) digits is 201600, while the sum is 43.

The spelling of 1685020501672 in words is "one trillion, six hundred eighty-five billion, twenty million, five hundred one thousand, six hundred seventy-two".