897644117818 has 32 divisors (see below), whose sum is σ = 1594791792000. Its totient is φ = 370759806144.

The previous prime is 897644117813. The next prime is 897644117833. The reversal of 897644117818 is 818711446798.

It is a super-2 number, since 2×897644117818² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 897644117818.

It is not an unprimeable number, because it can be changed into a prime (897644117813) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1798893 + ... + 2243056.

It is an arithmetic number, because the mean of its divisors is an integer number (49837243500).

Almost surely, 2^897644117818 is an apocalyptic number.

897644117818 is a deficient number, since it is larger than the sum of its proper divisors (697147674182).

897644117818 is a wasteful number, since it uses less digits than its factorization.

897644117818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4042534.

The product of its digits is 21676032, while the sum is 64.

The spelling of 897644117818 in words is "eight hundred ninety-seven billion, six hundred forty-four million, one hundred seventeen thousand, eight hundred eighteen".