649883861987 has 4 divisors (see below), whose sum is σ = 650255863656. Its totient is φ = 649511860320.

The previous prime is 649883861969. The next prime is 649883862053. The reversal of 649883861987 is 789168388946.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 649883861987 - 2¹⁸ = 649883599843 is a prime.

It is a super-2 number, since 2×649883861987² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (649883866987) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 185998214 + ... + 186001707.

It is an arithmetic number, because the mean of its divisors is an integer number (162563965914).

Almost surely, 2^649883861987 is an apocalyptic number.

649883861987 is a deficient number, since it is larger than the sum of its proper divisors (372001669).

649883861987 is a wasteful number, since it uses less digits than its factorization.

649883861987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 372001668.

The product of its digits is 1003290624, while the sum is 77.

The spelling of 649883861987 in words is "six hundred forty-nine billion, eight hundred eighty-three million, eight hundred sixty-one thousand, nine hundred eighty-seven".