872618921653 has 8 divisors (see below), whose sum is σ = 894042316440. Its totient is φ = 851202193920.

The previous prime is 872618921639. The next prime is 872618921683. The reversal of 872618921653 is 356129816278.

It can be written as a sum of positive squares in 4 ways, for example, as 3916631889 + 868702289764 = 62583^2 + 932042^2 .

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

It is a de Polignac number, because none of the positive numbers 2^k-872618921653 is a prime.

It is a super-2 number, since 2×872618921653² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (872618921633) 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, 1401268 + ... + 1925821.

It is an arithmetic number, because the mean of its divisors is an integer number (111755289555).

Almost surely, 2^872618921653 is an apocalyptic number.

It is an amenable number.

872618921653 is a deficient number, since it is larger than the sum of its proper divisors (21423394787).

872618921653 is a wasteful number, since it uses less digits than its factorization.

872618921653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3333527.

The product of its digits is 8709120, while the sum is 58.

The spelling of 872618921653 in words is "eight hundred seventy-two billion, six hundred eighteen million, nine hundred twenty-one thousand, six hundred fifty-three".