611966692089 has 9 divisors (see below), whose sum is σ = 883955278479. Its totient is φ = 407976230160.

The previous prime is 611966692081. The next prime is 611966692151. The reversal of 611966692089 is 980296669116.

The square root of 611966692089 is 782283.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 7864674489 + 604102017600 = 88683^2 + 777240^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 611966692089 - 2³ = 611966692081 is a prime.

It is not an unprimeable number, because it can be changed into a prime (611966692081) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2216469 + ... + 2477229.

Almost surely, 2^611966692089 is an apocalyptic number.

611966692089 is the 782283-rd square number.

611966692089 is the 391142-nd centered octagonal number.

It is an amenable number.

611966692089 is a deficient number, since it is larger than the sum of its proper divisors (271988586390).

611966692089 is an frugal number, since it uses more digits than its factorization.

611966692089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 521528 (or 260764 counting only the distinct ones).

The product of its (nonzero) digits is 15116544, while the sum is 63.

The spelling of 611966692089 in words is "six hundred eleven billion, nine hundred sixty-six million, six hundred ninety-two thousand, eighty-nine".