163577855993 has 2 divisors, whose sum is σ = 163577855994. Its totient is φ = 163577855992.

The previous prime is 163577855971. The next prime is 163577856007. The reversal of 163577855993 is 399558775361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 157638379369 + 5939476624 = 397037^2 + 77068^2 .

It is a cyclic number.

It is not a de Polignac number, because 163577855993 - 2⁶ = 163577855929 is a prime.

It is not a weakly prime, because it can be changed into another prime (163577855393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81788927996 + 81788927997.

It is an arithmetic number, because the mean of its divisors is an integer number (81788927997).

Almost surely, 2^163577855993 is an apocalyptic number.

It is an amenable number.

163577855993 is a deficient number, since it is larger than the sum of its proper divisors (1).

163577855993 is an equidigital number, since it uses as much as digits as its factorization.

163577855993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 214326000, while the sum is 68.

The spelling of 163577855993 in words is "one hundred sixty-three billion, five hundred seventy-seven million, eight hundred fifty-five thousand, nine hundred ninety-three".