1997132655 has 32 divisors (see below), whose sum is σ = 3844108800. Its totient is φ = 864922752.

The previous prime is 1997132653. The next prime is 1997132663. The reversal of 1997132655 is 5562317991.

It is not a de Polignac number, because 1997132655 - 2¹ = 1997132653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1997132653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 498540 + ... + 502529.

It is an arithmetic number, because the mean of its divisors is an integer number (120128400).

Almost surely, 2^1997132655 is an apocalyptic number.

1997132655 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1997132655 is a deficient number, since it is larger than the sum of its proper divisors (1846976145).

1997132655 is a wasteful number, since it uses less digits than its factorization.

1997132655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1001103.

The product of its digits is 510300, while the sum is 48.

The square root of 1997132655 is about 44689.2901599477. The cubic root of 1997132655 is about 1259.3186572047.

The spelling of 1997132655 in words is "one billion, nine hundred ninety-seven million, one hundred thirty-two thousand, six hundred fifty-five".