21746225565618 has 64 divisors (see below), whose sum is σ = 47629736432640. Its totient is φ = 6589298073600.

The previous prime is 21746225565607. The next prime is 21746225565643. The reversal of 21746225565618 is 81656552264712.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5146303 + ... + 8365218.

It is an arithmetic number, because the mean of its divisors is an integer number (744214631760).

Almost surely, 2^{21746225565618} is an apocalyptic number.

21746225565618 is an abundant number, since it is smaller than the sum of its proper divisors (25883510867022).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21746225565618 is a wasteful number, since it uses less digits than its factorization.

21746225565618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13512083.

The product of its digits is 48384000, while the sum is 60.

The spelling of 21746225565618 in words is "twenty-one trillion, seven hundred forty-six billion, two hundred twenty-five million, five hundred sixty-five thousand, six hundred eighteen".