491445037578 has 32 divisors (see below), whose sum is σ = 1072269063360. Its totient is φ = 148919218560.

The previous prime is 491445037561. The next prime is 491445037597. The reversal of 491445037578 is 875730544194.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4615476 + ... + 4720752.

It is an arithmetic number, because the mean of its divisors is an integer number (33508408230).

Almost surely, 2^491445037578 is an apocalyptic number.

491445037578 is an abundant number, since it is smaller than the sum of its proper divisors (580824025782).

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

491445037578 is a wasteful number, since it uses less digits than its factorization.

491445037578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176022.

The product of its (nonzero) digits is 16934400, while the sum is 57.

The spelling of 491445037578 in words is "four hundred ninety-one billion, four hundred forty-five million, thirty-seven thousand, five hundred seventy-eight".