221646257673061 has 4 divisors (see below), whose sum is σ = 238695969801772. Its totient is φ = 204596545544352.

The previous prime is 221646257672977. The next prime is 221646257673077. The reversal of 221646257673061 is 160376752646122.

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 51253700770561 + 170392556902500 = 7159169^2 + 13053450^2 .

It is not a de Polignac number, because 221646257673061 - 2³¹ = 221644110189413 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221646257672987 and 221646257673005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221646257473061) 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, 8524856064336 + ... + 8524856064361.

It is an arithmetic number, because the mean of its divisors is an integer number (59673992450443).

Almost surely, 2^{221646257673061} is an apocalyptic number.

It is an amenable number.

221646257673061 is a deficient number, since it is larger than the sum of its proper divisors (17049712128711).

221646257673061 is a wasteful number, since it uses less digits than its factorization.

221646257673061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17049712128710.

The product of its (nonzero) digits is 30481920, while the sum is 58.

The spelling of 221646257673061 in words is "two hundred twenty-one trillion, six hundred forty-six billion, two hundred fifty-seven million, six hundred seventy-three thousand, sixty-one".