1997377572309 has 16 divisors (see below), whose sum is σ = 3043812914688. Its totient is φ = 1141287382512.

The previous prime is 1997377572287. The next prime is 1997377572343. The reversal of 1997377572309 is 9032757737991.

It is a happy number.

It is not a de Polignac number, because 1997377572309 - 2¹² = 1997377568213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1997377572349) 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, 2622487 + ... + 3297300.

It is an arithmetic number, because the mean of its divisors is an integer number (190238307168).

Almost surely, 2^{1997377572309} is an apocalyptic number.

It is an amenable number.

1997377572309 is a deficient number, since it is larger than the sum of its proper divisors (1046435342379).

1997377572309 is a wasteful number, since it uses less digits than its factorization.

1997377572309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5935864.

The product of its (nonzero) digits is 157529610, while the sum is 69.

The spelling of 1997377572309 in words is "one trillion, nine hundred ninety-seven billion, three hundred seventy-seven million, five hundred seventy-two thousand, three hundred nine".