649076905637 has 4 divisors (see below), whose sum is σ = 664171717440. Its totient is φ = 633982093836.

The previous prime is 649076905601. The next prime is 649076905649. The reversal of 649076905637 is 736509670946.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 649076905637 - 2⁶ = 649076905573 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 649076905637.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649076902637) 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, 7547405837 + ... + 7547405922.

It is an arithmetic number, because the mean of its divisors is an integer number (166042929360).

Almost surely, 2^649076905637 is an apocalyptic number.

It is an amenable number.

649076905637 is a deficient number, since it is larger than the sum of its proper divisors (15094811803).

649076905637 is a wasteful number, since it uses less digits than its factorization.

649076905637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15094811802.

The product of its (nonzero) digits is 51438240, while the sum is 62.

The spelling of 649076905637 in words is "six hundred forty-nine billion, seventy-six million, nine hundred five thousand, six hundred thirty-seven".