222551661001 has 4 divisors (see below), whose sum is σ = 222624369604. Its totient is φ = 222478952400.

The previous prime is 222551660999. The next prime is 222551661049. The reversal of 222551661001 is 100166155222.

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 204597000976 + 17954660025 = 452324^2 + 133995^2 .

It is a cyclic number.

It is not a de Polignac number, because 222551661001 - 2¹ = 222551660999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (222551661091) 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, 36349710 + ... + 36355831.

It is an arithmetic number, because the mean of its divisors is an integer number (55656092401).

Almost surely, 2^222551661001 is an apocalyptic number.

It is an amenable number.

222551661001 is a deficient number, since it is larger than the sum of its proper divisors (72708603).

222551661001 is an equidigital number, since it uses as much as digits as its factorization.

222551661001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72708602.

The product of its (nonzero) digits is 7200, while the sum is 31.

The spelling of 222551661001 in words is "two hundred twenty-two billion, five hundred fifty-one million, six hundred sixty-one thousand, one".