1373331645 has 64 divisors (see below), whose sum is σ = 2812477440. Its totient is φ = 622810944.

The previous prime is 1373331637. The next prime is 1373331683. The reversal of 1373331645 is 5461333731.

1373331645 is a `hidden beast` number, since 1 + 3 + 7 + 3 + 3 + 3 + 1 + 645 = 666.

It is not a de Polignac number, because 1373331645 - 2³ = 1373331637 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 114294 + ... + 125736.

It is an arithmetic number, because the mean of its divisors is an integer number (43944960).

Almost surely, 2^1373331645 is an apocalyptic number.

1373331645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1373331645 is an abundant number, since it is smaller than the sum of its proper divisors (1439145795).

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

1373331645 is a wasteful number, since it uses less digits than its factorization.

1373331645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11591 (or 11585 counting only the distinct ones).

The product of its digits is 68040, while the sum is 36.

The square root of 1373331645 is about 37058.4895132006. The cubic root of 1373331645 is about 1111.5401192263.

The spelling of 1373331645 in words is "one billion, three hundred seventy-three million, three hundred thirty-one thousand, six hundred forty-five".