649505409538 has 16 divisors (see below), whose sum is σ = 999165711456. Its totient is φ = 316484269920.

The previous prime is 649505409439. The next prime is 649505409557. The reversal of 649505409538 is 835904505946.

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, 8486043 + ... + 8562238.

It is an arithmetic number, because the mean of its divisors is an integer number (62447856966).

Almost surely, 2^649505409538 is an apocalyptic number.

649505409538 is a deficient number, since it is larger than the sum of its proper divisors (349660301918).

649505409538 is a wasteful number, since it uses less digits than its factorization.

649505409538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17048769.

The product of its (nonzero) digits is 23328000, while the sum is 58.

The spelling of 649505409538 in words is "six hundred forty-nine billion, five hundred five million, four hundred nine thousand, five hundred thirty-eight".