216690770491 has 8 divisors (see below), whose sum is σ = 233363362064. Its totient is φ = 200018760480.

The previous prime is 216690770431. The next prime is 216690770497. The reversal of 216690770491 is 194077096612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 216690770491 - 2¹⁷ = 216690639419 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216690770497) 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, 914920 + ... + 1127146.

It is an arithmetic number, because the mean of its divisors is an integer number (29170420258).

Almost surely, 2^216690770491 is an apocalyptic number.

216690770491 is a deficient number, since it is larger than the sum of its proper divisors (16672591573).

216690770491 is a wasteful number, since it uses less digits than its factorization.

216690770491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 290781.

The product of its (nonzero) digits is 1143072, while the sum is 52.

The spelling of 216690770491 in words is "two hundred sixteen billion, six hundred ninety million, seven hundred seventy thousand, four hundred ninety-one".