216690320156261 has 8 divisors (see below), whose sum is σ = 249128990839680. Its totient is φ = 184622377138128.

The previous prime is 216690320156231. The next prime is 216690320156353. The reversal of 216690320156261 is 162651023096612.

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 216690320156261 - 2¹⁴ = 216690320139877 is a prime.

It is a super-2 number, since 2×216690320156261² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216690320156221) 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, 92681915066 + ... + 92681917403.

It is an arithmetic number, because the mean of its divisors is an integer number (31141123854960).

Almost surely, 2^{216690320156261} is an apocalyptic number.

It is an amenable number.

216690320156261 is a deficient number, since it is larger than the sum of its proper divisors (32438670683419).

216690320156261 is a wasteful number, since it uses less digits than its factorization.

216690320156261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185363832643.

The product of its (nonzero) digits is 1399680, while the sum is 50.

The spelling of 216690320156261 in words is "two hundred sixteen trillion, six hundred ninety billion, three hundred twenty million, one hundred fifty-six thousand, two hundred sixty-one".