1678263048991 has 8 divisors (see below), whose sum is σ = 1810512413424. Its totient is φ = 1549739018880.

The previous prime is 1678263048989. The next prime is 1678263049027. The reversal of 1678263048991 is 1998403628761.

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 1678263048991 - 2¹ = 1678263048989 is a prime.

It is a super-2 number, since 2×1678263048991² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1678263048911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 931332645 + ... + 931334446.

It is an arithmetic number, because the mean of its divisors is an integer number (226314051678).

Almost surely, 2^{1678263048991} is an apocalyptic number.

1678263048991 is a deficient number, since it is larger than the sum of its proper divisors (132249364433).

1678263048991 is a wasteful number, since it uses less digits than its factorization.

1678263048991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1862667161.

The product of its (nonzero) digits is 31352832, while the sum is 64.

The spelling of 1678263048991 in words is "one trillion, six hundred seventy-eight billion, two hundred sixty-three million, forty-eight thousand, nine hundred ninety-one".