653654162156321 has 4 divisors (see below), whose sum is σ = 653657441891652. Its totient is φ = 653650882420992.

The previous prime is 653654162156287. The next prime is 653654162156327. The reversal of 653654162156321 is 123651261456356.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 368886377152225 + 284767785004096 = 19206415^2 + 16875064^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-653654162156321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (653654162156327) 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, 1639568696 + ... + 1639967321.

It is an arithmetic number, because the mean of its divisors is an integer number (163414360472913).

Almost surely, 2^{653654162156321} is an apocalyptic number.

It is an amenable number.

653654162156321 is a deficient number, since it is larger than the sum of its proper divisors (3279735331).

653654162156321 is a wasteful number, since it uses less digits than its factorization.

653654162156321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3279735330.

The product of its digits is 23328000, while the sum is 56.

The spelling of 653654162156321 in words is "six hundred fifty-three trillion, six hundred fifty-four billion, one hundred sixty-two million, one hundred fifty-six thousand, three hundred twenty-one".