1997627693645 has 16 divisors (see below), whose sum is σ = 2407999164912. Its totient is φ = 1590886809600.

The previous prime is 1997627693629. The next prime is 1997627693657. The reversal of 1997627693645 is 5463967267991.

It can be written as a sum of positive squares in 8 ways, for example, as 95043340681 + 1902584352964 = 308291^2 + 1379342^2 .

It is not a de Polignac number, because 1997627693645 - 2⁴ = 1997627693629 is a prime.

It is a super-3 number, since 3×1997627693645³ (a number of 38 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 92345 + ... + 2000945.

It is an arithmetic number, because the mean of its divisors is an integer number (150499947807).

Almost surely, 2^{1997627693645} is an apocalyptic number.

It is an amenable number.

1997627693645 is a deficient number, since it is larger than the sum of its proper divisors (410371471267).

1997627693645 is a wasteful number, since it uses less digits than its factorization.

1997627693645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1909552.

The product of its digits is 925888320, while the sum is 74.

The spelling of 1997627693645 in words is "one trillion, nine hundred ninety-seven billion, six hundred twenty-seven million, six hundred ninety-three thousand, six hundred forty-five".