645415566354 has 24 divisors (see below), whose sum is σ = 1505969655372. Its totient is φ = 198589404960.

The previous prime is 645415566331. The next prime is 645415566407. The reversal of 645415566354 is 453665514546.

645415566354 is a `hidden beast` number, since 6 + 4 + 5 + 41 + 5 + 566 + 35 + 4 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 632306461329 + 13109105025 = 795177^2 + 114495^2 .

It is a super-2 number, since 2×645415566354² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 645415566354.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 1379092857 + ... + 1379093324.

Almost surely, 2^645415566354 is an apocalyptic number.

645415566354 is an abundant number, since it is smaller than the sum of its proper divisors (860554089018).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

645415566354 is a wasteful number, since it uses less digits than its factorization.

645415566354 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2758186202 (or 2758186199 counting only the distinct ones).

The product of its digits is 25920000, while the sum is 54.

The spelling of 645415566354 in words is "six hundred forty-five billion, four hundred fifteen million, five hundred sixty-six thousand, three hundred fifty-four".