650865381381 has 12 divisors (see below), whose sum is σ = 940752972640. Its totient is φ = 433626828840.

The previous prime is 650865381301. The next prime is 650865381391. The reversal of 650865381381 is 183183568056.

650865381381 is a `hidden beast` number, since 6 + 508 + 6 + 53 + 8 + 1 + 3 + 81 = 666.

It is not a de Polignac number, because 650865381381 - 2¹³ = 650865373189 is a prime.

It is a super-3 number, since 3×650865381381³ (a number of 36 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (650865381301) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23604241 + ... + 23631798.

Almost surely, 2^650865381381 is an apocalyptic number.

It is an amenable number.

650865381381 is a deficient number, since it is larger than the sum of its proper divisors (289887591259).

650865381381 is a wasteful number, since it uses less digits than its factorization.

650865381381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47237576 (or 47237573 counting only the distinct ones).

The product of its (nonzero) digits is 4147200, while the sum is 54.

The spelling of 650865381381 in words is "six hundred fifty billion, eight hundred sixty-five million, three hundred eighty-one thousand, three hundred eighty-one".