645111051 has 16 divisors (see below), whose sum is σ = 941502240. Its totient is φ = 390481920.

The previous prime is 645111037. The next prime is 645111059. The reversal of 645111051 is 150111546.

It is not a de Polignac number, because 645111051 - 2¹⁹ = 644586763 is a prime.

It is not an unprimeable number, because it can be changed into a prime (645111059) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 133206 + ... + 137963.

It is an arithmetic number, because the mean of its divisors is an integer number (58843890).

Almost surely, 2^645111051 is an apocalyptic number.

645111051 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

645111051 is a deficient number, since it is larger than the sum of its proper divisors (296391189).

645111051 is a wasteful number, since it uses less digits than its factorization.

645111051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271246.

The product of its (nonzero) digits is 600, while the sum is 24.

The square root of 645111051 is about 25399.0364187305. The cubic root of 645111051 is about 864.0618431920.

Adding to 645111051 its reverse (150111546), we get a palindrome (795222597).

It can be divided in two parts, 64 and 5111051, that added together give a palindrome (5111115).

The spelling of 645111051 in words is "six hundred forty-five million, one hundred eleven thousand, fifty-one".