491351379217775 has 12 divisors (see below), whose sum is σ = 609387895209744. Its totient is φ = 393008725968000.

The previous prime is 491351379217603. The next prime is 491351379217789. The reversal of 491351379217775 is 577712973153194.

It is not a de Polignac number, because 491351379217775 - 2⁴² = 486953332706671 is a prime.

It is a hoax number, since the sum of its digits (71) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 491351379217699 and 491351379217708.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1809296666 + ... + 1809568215.

It is an arithmetic number, because the mean of its divisors is an integer number (50782324600812).

Almost surely, 2^{491351379217775} is an apocalyptic number.

491351379217775 is a deficient number, since it is larger than the sum of its proper divisors (118036515991969).

491351379217775 is a wasteful number, since it uses less digits than its factorization.

491351379217775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3618870322 (or 3618870317 counting only the distinct ones).

The product of its digits is 350065800, while the sum is 71.

The spelling of 491351379217775 in words is "four hundred ninety-one trillion, three hundred fifty-one billion, three hundred seventy-nine million, two hundred seventeen thousand, seven hundred seventy-five".