1645688412045 has 12 divisors (see below), whose sum is σ = 2852526580956. Its totient is φ = 877700486400.

The previous prime is 1645688412013. The next prime is 1645688412079. The reversal of 1645688412045 is 5402148865461.

1645688412045 is a `hidden beast` number, since 1 + 64 + 56 + 88 + 412 + 0 + 45 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1285915176324 + 359773235721 = 1133982^2 + 599811^2 .

It is not a de Polignac number, because 1645688412045 - 2⁵ = 1645688412013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1645688411982 and 1645688412000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18285426756 + ... + 18285426845.

It is an arithmetic number, because the mean of its divisors is an integer number (237710548413).

Almost surely, 2^{1645688412045} is an apocalyptic number.

1645688412045 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1645688412045 is a deficient number, since it is larger than the sum of its proper divisors (1206838168911).

1645688412045 is a wasteful number, since it uses less digits than its factorization.

1645688412045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36570853612 (or 36570853609 counting only the distinct ones).

The product of its (nonzero) digits is 7372800, while the sum is 54.

The spelling of 1645688412045 in words is "one trillion, six hundred forty-five billion, six hundred eighty-eight million, four hundred twelve thousand, forty-five".