649037523638 has 16 divisors (see below), whose sum is σ = 1118461077504. Its totient is φ = 276702608040.

The previous prime is 649037523599. The next prime is 649037523661. The reversal of 649037523638 is 836325730946.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 121358120 + ... + 121363467.

It is an arithmetic number, because the mean of its divisors is an integer number (69903817344).

Almost surely, 2^649037523638 is an apocalyptic number.

649037523638 is a deficient number, since it is larger than the sum of its proper divisors (469423553866).

649037523638 is a wasteful number, since it uses less digits than its factorization.

649037523638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242721787.

The product of its (nonzero) digits is 19595520, while the sum is 56.

The spelling of 649037523638 in words is "six hundred forty-nine billion, thirty-seven million, five hundred twenty-three thousand, six hundred thirty-eight".