649036209755 has 4 divisors (see below), whose sum is σ = 778843451712. Its totient is φ = 519228967800.

The previous prime is 649036209751. The next prime is 649036209763. The reversal of 649036209755 is 557902630946.

It is a happy number.

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

It is not a de Polignac number, because 649036209755 - 2² = 649036209751 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 649036209755.

It is not an unprimeable number, because it can be changed into a prime (649036209751) 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, 64903620971 + ... + 64903620980.

It is an arithmetic number, because the mean of its divisors is an integer number (194710862928).

Almost surely, 2^649036209755 is an apocalyptic number.

649036209755 is a deficient number, since it is larger than the sum of its proper divisors (129807241957).

649036209755 is a wasteful number, since it uses less digits than its factorization.

649036209755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129807241956.

The product of its (nonzero) digits is 12247200, while the sum is 56.

The spelling of 649036209755 in words is "six hundred forty-nine billion, thirty-six million, two hundred nine thousand, seven hundred fifty-five".