1997508664255 has 12 divisors (see below), whose sum is σ = 2595579306840. Its totient is φ = 1475083320672.

The previous prime is 1997508664241. The next prime is 1997508664379. The reversal of 1997508664255 is 5524668057991.

It is not a de Polignac number, because 1997508664255 - 2⁹ = 1997508663743 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1181956945 + ... + 1181958634.

It is an arithmetic number, because the mean of its divisors is an integer number (216298275570).

Almost surely, 2^{1997508664255} is an apocalyptic number.

1997508664255 is a deficient number, since it is larger than the sum of its proper divisors (598070642585).

1997508664255 is a wasteful number, since it uses less digits than its factorization.

1997508664255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2363915610 (or 2363915597 counting only the distinct ones).

The product of its (nonzero) digits is 163296000, while the sum is 67.

The spelling of 1997508664255 in words is "one trillion, nine hundred ninety-seven billion, five hundred eight million, six hundred sixty-four thousand, two hundred fifty-five".