1678690557091 has 8 divisors (see below), whose sum is σ = 1752508335600. Its totient is φ = 1605934905120.

The previous prime is 1678690557079. The next prime is 1678690557113. The reversal of 1678690557091 is 1907550968761.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1678690557091 - 2¹¹ = 1678690555043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1678690957091) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 265528405 + ... + 265534726.

It is an arithmetic number, because the mean of its divisors is an integer number (219063541950).

Almost surely, 2^{1678690557091} is an apocalyptic number.

1678690557091 is a deficient number, since it is larger than the sum of its proper divisors (73817778509).

1678690557091 is a wasteful number, since it uses less digits than its factorization.

1678690557091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 531063269.

The product of its (nonzero) digits is 28576800, while the sum is 64.

The spelling of 1678690557091 in words is "one trillion, six hundred seventy-eight billion, six hundred ninety million, five hundred fifty-seven thousand, ninety-one".