1201642266 has 64 divisors (see below), whose sum is σ = 2704306176. Its totient is φ = 352756800.

The previous prime is 1201642177. The next prime is 1201642333. The reversal of 1201642266 is 6622461021.

It is a super-2 number, since 2×1201642266² = 2887888270875229512, which contains 22 as substring.

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, 641311 + ... + 643181.

It is an arithmetic number, because the mean of its divisors is an integer number (42254784).

Almost surely, 2^1201642266 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1201642266, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1352153088).

1201642266 is an abundant number, since it is smaller than the sum of its proper divisors (1502663910).

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

1201642266 is a wasteful number, since it uses less digits than its factorization.

1201642266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2187.

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 1201642266 is about 34664.7121147717. The cubic root of 1201642266 is about 1063.1431171057.

The spelling of 1201642266 in words is "one billion, two hundred one million, six hundred forty-two thousand, two hundred sixty-six".