221660142407463 has 4 divisors (see below), whose sum is σ = 295546856543288. Its totient is φ = 147773428271640.

The previous prime is 221660142407443. The next prime is 221660142407513. The reversal of 221660142407463 is 364704241066122.

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

It is not a de Polignac number, because 221660142407463 - 2²² = 221660138213159 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221660142407443) 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, 36943357067908 + ... + 36943357067913.

It is an arithmetic number, because the mean of its divisors is an integer number (73886714135822).

Almost surely, 2^{221660142407463} is an apocalyptic number.

221660142407463 is a deficient number, since it is larger than the sum of its proper divisors (73886714135825).

221660142407463 is an equidigital number, since it uses as much as digits as its factorization.

221660142407463 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73886714135824.

The product of its (nonzero) digits is 2322432, while the sum is 48.

The spelling of 221660142407463 in words is "two hundred twenty-one trillion, six hundred sixty billion, one hundred forty-two million, four hundred seven thousand, four hundred sixty-three".