649729662981 has 8 divisors (see below), whose sum is σ = 990064248384. Its totient is φ = 371274093120.

The previous prime is 649729662977. The next prime is 649729663117. The reversal of 649729662981 is 189266927946.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 649729662981 - 2² = 649729662977 is a prime.

It is a super-2 number, since 2×649729662981² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649729662941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15469753860 + ... + 15469753901.

It is an arithmetic number, because the mean of its divisors is an integer number (123758031048).

Almost surely, 2^649729662981 is an apocalyptic number.

It is an amenable number.

649729662981 is a deficient number, since it is larger than the sum of its proper divisors (340334585403).

649729662981 is a wasteful number, since it uses less digits than its factorization.

649729662981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30939507771.

The product of its digits is 141087744, while the sum is 69.

The spelling of 649729662981 in words is "six hundred forty-nine billion, seven hundred twenty-nine million, six hundred sixty-two thousand, nine hundred eighty-one".