216605257077 has 32 divisors (see below), whose sum is σ = 322864496640. Its totient is φ = 128044032320.

The previous prime is 216605257031. The next prime is 216605257093. The reversal of 216605257077 is 770752506612.

It is a cyclic number.

It is not a de Polignac number, because 216605257077 - 2⁶ = 216605257013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216605257777) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 216124 + ... + 692762.

It is an arithmetic number, because the mean of its divisors is an integer number (10089515520).

Almost surely, 2^216605257077 is an apocalyptic number.

It is an amenable number.

216605257077 is a deficient number, since it is larger than the sum of its proper divisors (106259239563).

216605257077 is a wasteful number, since it uses less digits than its factorization.

216605257077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 476993.

The product of its (nonzero) digits is 1234800, while the sum is 48.

The spelling of 216605257077 in words is "two hundred sixteen billion, six hundred five million, two hundred fifty-seven thousand, seventy-seven".