1638694870797 has 16 divisors (see below), whose sum is σ = 2315358360000. Its totient is φ = 1028019101184.

The previous prime is 1638694870777. The next prime is 1638694870837. The reversal of 1638694870797 is 7970784968361.

It is not a de Polignac number, because 1638694870797 - 2¹⁵ = 1638694838029 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1638694870777) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 96464772 + ... + 96481757.

It is an arithmetic number, because the mean of its divisors is an integer number (144709897500).

Almost surely, 2^{1638694870797} is an apocalyptic number.

It is an amenable number.

1638694870797 is a deficient number, since it is larger than the sum of its proper divisors (676663489203).

1638694870797 is a wasteful number, since it uses less digits than its factorization.

1638694870797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192946700.

The product of its (nonzero) digits is 768144384, while the sum is 75.

The spelling of 1638694870797 in words is "one trillion, six hundred thirty-eight billion, six hundred ninety-four million, eight hundred seventy thousand, seven hundred ninety-seven".