217225494157 has 4 divisors (see below), whose sum is σ = 248257707616. Its totient is φ = 186193280700.

The previous prime is 217225494139. The next prime is 217225494163. The reversal of 217225494157 is 751494522712.

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 not a de Polignac number, because 217225494157 - 2²⁷ = 217091276429 is a prime.

It is a super-2 number, since 2×217225494157² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 217225494157.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217225494257) 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, 15516106719 + ... + 15516106732.

It is an arithmetic number, because the mean of its divisors is an integer number (62064426904).

Almost surely, 2^217225494157 is an apocalyptic number.

It is an amenable number.

217225494157 is a deficient number, since it is larger than the sum of its proper divisors (31032213459).

217225494157 is an equidigital number, since it uses as much as digits as its factorization.

217225494157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31032213458.

The product of its digits is 1411200, while the sum is 49.

The spelling of 217225494157 in words is "two hundred seventeen billion, two hundred twenty-five million, four hundred ninety-four thousand, one hundred fifty-seven".