217261450497 has 144 divisors (see below), whose sum is σ = 381537607680. Its totient is φ = 109468195200.

The previous prime is 217261450489. The next prime is 217261450499. The reversal of 217261450497 is 794054162712.

It is not a de Polignac number, because 217261450497 - 2³ = 217261450489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (217261450499) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 60838722 + ... + 60842292.

It is an arithmetic number, because the mean of its divisors is an integer number (2649566720).

Almost surely, 2^217261450497 is an apocalyptic number.

It is an amenable number.

217261450497 is a deficient number, since it is larger than the sum of its proper divisors (164276157183).

217261450497 is a wasteful number, since it uses less digits than its factorization.

217261450497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3724 (or 3704 counting only the distinct ones).

The product of its (nonzero) digits is 846720, while the sum is 48.

The spelling of 217261450497 in words is "two hundred seventeen billion, two hundred sixty-one million, four hundred fifty thousand, four hundred ninety-seven".