645411050531 has 6 divisors (see below), whose sum is σ = 698877054900. Its totient is φ = 595764046488.

The previous prime is 645411050489. The next prime is 645411050563. The reversal of 645411050531 is 135050114546.

It is a de Polignac number, because none of the positive numbers 2^k-645411050531 is a prime.

It is a super-2 number, since 2×645411050531² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 645411050491 and 645411050500.

It is not an unprimeable number, because it can be changed into a prime (645411050231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1909499981 + ... + 1909500318.

It is an arithmetic number, because the mean of its divisors is an integer number (116479509150).

Almost surely, 2^645411050531 is an apocalyptic number.

645411050531 is a deficient number, since it is larger than the sum of its proper divisors (53466004369).

645411050531 is a wasteful number, since it uses less digits than its factorization.

645411050531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3819000325 (or 3819000312 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 35.

The spelling of 645411050531 in words is "six hundred forty-five billion, four hundred eleven million, fifty thousand, five hundred thirty-one".