645415051613 has 4 divisors (see below), whose sum is σ = 645595793088. Its totient is φ = 645234310140.

The previous prime is 645415051553. The next prime is 645415051639. The reversal of 645415051613 is 316150514546.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 645415051613 - 2⁸ = 645415051357 is a prime.

It is a super-2 number, since 2×645415051613² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645415051213) 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 3 ways as a sum of consecutive naturals, for example, 90365381 + ... + 90372522.

It is an arithmetic number, because the mean of its divisors is an integer number (161398948272).

Almost surely, 2^645415051613 is an apocalyptic number.

It is an amenable number.

645415051613 is a deficient number, since it is larger than the sum of its proper divisors (180741475).

645415051613 is a wasteful number, since it uses less digits than its factorization.

645415051613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180741474.

The product of its (nonzero) digits is 216000, while the sum is 41.

The spelling of 645415051613 in words is "six hundred forty-five billion, four hundred fifteen million, fifty-one thousand, six hundred thirteen".