163788990997 has 4 divisors (see below), whose sum is σ = 163850040640. Its totient is φ = 163727941356.

The previous prime is 163788990979. The next prime is 163788991007. The reversal of 163788990997 is 799099887361.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-163788990997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163788993997) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30520797 + ... + 30526162.

It is an arithmetic number, because the mean of its divisors is an integer number (40962510160).

Almost surely, 2^163788990997 is an apocalyptic number.

It is an amenable number.

163788990997 is a deficient number, since it is larger than the sum of its proper divisors (61049643).

163788990997 is an equidigital number, since it uses as much as digits as its factorization.

163788990997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61049642.

The product of its (nonzero) digits is 370355328, while the sum is 76.

The spelling of 163788990997 in words is "one hundred sixty-three billion, seven hundred eighty-eight million, nine hundred ninety thousand, nine hundred ninety-seven".