640222151011 has 4 divisors (see below), whose sum is σ = 640229994432. Its totient is φ = 640214307592.

The previous prime is 640222150999. The next prime is 640222151021. The reversal of 640222151011 is 110151222046.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 110151222046 = 2 ⋅55075611023.

It is a cyclic number.

It is not a de Polignac number, because 640222151011 - 2¹⁷ = 640222019939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (640222151021) 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, 3797971 + ... + 3962956.

It is an arithmetic number, because the mean of its divisors is an integer number (160057498608).

Almost surely, 2^640222151011 is an apocalyptic number.

640222151011 is a deficient number, since it is larger than the sum of its proper divisors (7843421).

640222151011 is an equidigital number, since it uses as much as digits as its factorization.

640222151011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7843420.

The product of its (nonzero) digits is 960, while the sum is 25.

Adding to 640222151011 its reverse (110151222046), we get a palindrome (750373373057).

The spelling of 640222151011 in words is "six hundred forty billion, two hundred twenty-two million, one hundred fifty-one thousand, eleven".