649566254260 has 96 divisors (see below), whose sum is σ = 1701485533440. Its totient is φ = 202366617600.

The previous prime is 649566254221. The next prime is 649566254261. The reversal of 649566254260 is 62452665946.

It is a Harshad number since it is a multiple of its sum of digits (55).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649566254261) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3198636 + ... + 3395644.

It is an arithmetic number, because the mean of its divisors is an integer number (17723807640).

Almost surely, 2^649566254260 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 649566254260, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (850742766720).

649566254260 is an abundant number, since it is smaller than the sum of its proper divisors (1051919279180).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

649566254260 is a wasteful number, since it uses less digits than its factorization.

649566254260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199177 (or 199175 counting only the distinct ones).

The product of its (nonzero) digits is 18662400, while the sum is 55.

The spelling of 649566254260 in words is "six hundred forty-nine billion, five hundred sixty-six million, two hundred fifty-four thousand, two hundred sixty".