491678546645 has 64 divisors (see below), whose sum is σ = 723568495104. Its totient is φ = 315610014720.

The previous prime is 491678546629. The next prime is 491678546659. The reversal of 491678546645 is 546645876194.

It is not a de Polignac number, because 491678546645 - 2⁴ = 491678546629 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (65).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 77831027 + ... + 77837343.

It is an arithmetic number, because the mean of its divisors is an integer number (11305757736).

Almost surely, 2^491678546645 is an apocalyptic number.

It is an amenable number.

491678546645 is a deficient number, since it is larger than the sum of its proper divisors (231889948459).

491678546645 is a wasteful number, since it uses less digits than its factorization.

491678546645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11102.

The product of its digits is 174182400, while the sum is 65.

The spelling of 491678546645 in words is "four hundred ninety-one billion, six hundred seventy-eight million, five hundred forty-six thousand, six hundred forty-five".