3685721722784 has 12 divisors (see below), whose sum is σ = 7256264641794. Its totient is φ = 1842860861376.

The previous prime is 3685721722777. The next prime is 3685721722801. The reversal of 3685721722784 is 4872271275863.

It can be written as a sum of positive squares in only one way, i.e., 3342827155600 + 342894567184 = 1828340^2 + 585572^2 .

It is a Smith number, since the sum of its digits (62) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57589401887 + ... + 57589401950.

Almost surely, 2^{3685721722784} is an apocalyptic number.

It is an amenable number.

3685721722784 is a deficient number, since it is larger than the sum of its proper divisors (3570542919010).

3685721722784 is a wasteful number, since it uses less digits than its factorization.

3685721722784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115178803847 (or 115178803839 counting only the distinct ones).

The product of its digits is 63221760, while the sum is 62.

The spelling of 3685721722784 in words is "three trillion, six hundred eighty-five billion, seven hundred twenty-one million, seven hundred twenty-two thousand, seven hundred eighty-four".