645611415547 has 16 divisors (see below), whose sum is σ = 781294541760. Its totient is φ = 520795726848.

The previous prime is 645611415541. The next prime is 645611415563. The reversal of 645611415547 is 745514116546.

It is a cyclic number.

It is not a de Polignac number, because 645611415547 - 2²⁷ = 645477197819 is a prime.

It is a super-3 number, since 3×645611415547³ (a number of 36 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

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 645611415547.

It is not an unprimeable number, because it can be changed into a prime (645611415541) 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, 1764103 + ... + 2098399.

It is an arithmetic number, because the mean of its divisors is an integer number (48830908860).

Almost surely, 2^645611415547 is an apocalyptic number.

645611415547 is a deficient number, since it is larger than the sum of its proper divisors (135683126213).

645611415547 is a wasteful number, since it uses less digits than its factorization.

645611415547 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 350550.

The product of its digits is 2016000, while the sum is 49.

The spelling of 645611415547 in words is "six hundred forty-five billion, six hundred eleven million, four hundred fifteen thousand, five hundred forty-seven".