216397149697 has 4 divisors (see below), whose sum is σ = 216427622400. Its totient is φ = 216366676996.

The previous prime is 216397149671. The next prime is 216397149707. The reversal of 216397149697 is 796941793612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 216397149697 - 2¹¹ = 216397147649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216397149797) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15225697 + ... + 15239902.

It is an arithmetic number, because the mean of its divisors is an integer number (54106905600).

Almost surely, 2^216397149697 is an apocalyptic number.

It is an amenable number.

216397149697 is a deficient number, since it is larger than the sum of its proper divisors (30472703).

216397149697 is an equidigital number, since it uses as much as digits as its factorization.

216397149697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30472702.

The product of its digits is 30862944, while the sum is 64.

The spelling of 216397149697 in words is "two hundred sixteen billion, three hundred ninety-seven million, one hundred forty-nine thousand, six hundred ninety-seven".