172097720977 has 8 divisors (see below), whose sum is σ = 211812579776. Its totient is φ = 136165229712.

The previous prime is 172097720969. The next prime is 172097720987. The reversal of 172097720977 is 779027790271.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 172097720977 - 2³ = 172097720969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (172097720917) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 945591783 + ... + 945591964.

It is an arithmetic number, because the mean of its divisors is an integer number (26476572472).

Almost surely, 2^172097720977 is an apocalyptic number.

It is an amenable number.

172097720977 is a deficient number, since it is larger than the sum of its proper divisors (39714858799).

172097720977 is a wasteful number, since it uses less digits than its factorization.

172097720977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1891183767.

The product of its (nonzero) digits is 5445468, while the sum is 58.

The spelling of 172097720977 in words is "one hundred seventy-two billion, ninety-seven million, seven hundred twenty thousand, nine hundred seventy-seven".