491505771072 has 56 divisors (see below), whose sum is σ = 1305241171072. Its totient is φ = 163230681600.

The previous prime is 491505771049. The next prime is 491505771089. The reversal of 491505771072 is 270177505194.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4671079 + ... + 4775142.

Almost surely, 2^491505771072 is an apocalyptic number.

It is an amenable number.

491505771072 is an abundant number, since it is smaller than the sum of its proper divisors (813735400000).

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

491505771072 is a wasteful number, since it uses less digits than its factorization.

491505771072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9446507 (or 9446497 counting only the distinct ones).

The product of its (nonzero) digits is 617400, while the sum is 48.

The spelling of 491505771072 in words is "four hundred ninety-one billion, five hundred five million, seven hundred seventy-one thousand, seventy-two".