1345666912578 has 24 divisors (see below), whose sum is σ = 2944479089916. Its totient is φ = 444114492000.

The previous prime is 1345666912561. The next prime is 1345666912613. The reversal of 1345666912578 is 8752196665431.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1313859260169 + 31807652409 = 1146237^2 + 178347^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 370093593 + ... + 370097228.

Almost surely, 2^{1345666912578} is an apocalyptic number.

1345666912578 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1345666912578 is an abundant number, since it is smaller than the sum of its proper divisors (1598812177338).

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

1345666912578 is a wasteful number, since it uses less digits than its factorization.

1345666912578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 740190930 (or 740190927 counting only the distinct ones).

The product of its digits is 65318400, while the sum is 63.

The spelling of 1345666912578 in words is "one trillion, three hundred forty-five billion, six hundred sixty-six million, nine hundred twelve thousand, five hundred seventy-eight".