157205171206721 has 8 divisors (see below), whose sum is σ = 171499924344000. Its totient is φ = 142910980392240.

The previous prime is 157205171206663. The next prime is 157205171206753. The reversal of 157205171206721 is 127602171502751.

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 157205171206721 - 2⁴⁶ = 86836427029057 is a prime.

It is a super-2 number, since 2×157205171206721² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (157205171206621) 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, 139996046 + ... + 141114503.

It is an arithmetic number, because the mean of its divisors is an integer number (21437490543000).

Almost surely, 2^{157205171206721} is an apocalyptic number.

157205171206721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

157205171206721 is a deficient number, since it is larger than the sum of its proper divisors (14294753137279).

157205171206721 is a wasteful number, since it uses less digits than its factorization.

157205171206721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281161399.

The product of its (nonzero) digits is 411600, while the sum is 47.

The spelling of 157205171206721 in words is "one hundred fifty-seven trillion, two hundred five billion, one hundred seventy-one million, two hundred six thousand, seven hundred twenty-one".