172397778963 has 4 divisors (see below), whose sum is σ = 229863705288. Its totient is φ = 114931852640.

The previous prime is 172397778929. The next prime is 172397778979. The reversal of 172397778963 is 369877793271.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 172397778963 - 2⁶ = 172397778899 is a prime.

It is not an unprimeable number, because it can be changed into a prime (172397778563) 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, 28732963158 + ... + 28732963163.

It is an arithmetic number, because the mean of its divisors is an integer number (57465926322).

Almost surely, 2^172397778963 is an apocalyptic number.

172397778963 is a deficient number, since it is larger than the sum of its proper divisors (57465926325).

172397778963 is an equidigital number, since it uses as much as digits as its factorization.

172397778963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57465926324.

The product of its digits is 168031584, while the sum is 69.

The spelling of 172397778963 in words is "one hundred seventy-two billion, three hundred ninety-seven million, seven hundred seventy-eight thousand, nine hundred sixty-three".