491138210203280 has 40 divisors (see below), whose sum is σ = 1150231348519992. Its totient is φ = 195021303901184.

The previous prime is 491138210203279. The next prime is 491138210203283. The reversal of 491138210203280 is 82302012831194.

It can be written as a sum of positive squares in 4 ways, for example, as 77671859690896 + 413466350512384 = 8813164^2 + 20333872^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (491138210203283) 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, 22405929287 + ... + 22405951206.

Almost surely, 2^{491138210203280} is an apocalyptic number.

491138210203280 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

491138210203280 is an abundant number, since it is smaller than the sum of its proper divisors (659093138316712).

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

491138210203280 is a wasteful number, since it uses less digits than its factorization.

491138210203280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44811880643 (or 44811880637 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 44.

The spelling of 491138210203280 in words is "four hundred ninety-one trillion, one hundred thirty-eight billion, two hundred ten million, two hundred three thousand, two hundred eighty".