645415640211 has 4 divisors (see below), whose sum is σ = 860554186952. Its totient is φ = 430277093472.

The previous prime is 645415640209. The next prime is 645415640269. The reversal of 645415640211 is 112046514546.

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

It is not a de Polignac number, because 645415640211 - 2¹ = 645415640209 is a prime.

It is a super-2 number, since 2×645415640211² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 645415640211.

It is not an unprimeable number, because it can be changed into a prime (645415640281) 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, 107569273366 + ... + 107569273371.

It is an arithmetic number, because the mean of its divisors is an integer number (215138546738).

Almost surely, 2^645415640211 is an apocalyptic number.

645415640211 is a deficient number, since it is larger than the sum of its proper divisors (215138546741).

645415640211 is a wasteful number, since it uses less digits than its factorization.

645415640211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215138546740.

The product of its (nonzero) digits is 115200, while the sum is 39.

The spelling of 645415640211 in words is "six hundred forty-five billion, four hundred fifteen million, six hundred forty thousand, two hundred eleven".