201224564442661 has 4 divisors (see below), whose sum is σ = 203178200990752. Its totient is φ = 199270927894572.

The previous prime is 201224564442613. The next prime is 201224564442667. The reversal of 201224564442661 is 166244465422102.

201224564442661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 201224564442661 - 2¹⁵ = 201224564409893 is a prime.

It is a super-3 number, since 3×201224564442661³ (a number of 44 digits) contains 333 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 (201224564442667) 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, 976818273891 + ... + 976818274096.

It is an arithmetic number, because the mean of its divisors is an integer number (50794550247688).

Almost surely, 2^{201224564442661} is an apocalyptic number.

It is an amenable number.

201224564442661 is a deficient number, since it is larger than the sum of its proper divisors (1953636548091).

201224564442661 is a wasteful number, since it uses less digits than its factorization.

201224564442661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1953636548090.

The product of its (nonzero) digits is 4423680, while the sum is 49.

The spelling of 201224564442661 in words is "two hundred one trillion, two hundred twenty-four billion, five hundred sixty-four million, four hundred forty-two thousand, six hundred sixty-one".