649562773860 has 2304 divisors, whose sum is σ = 2905943040000. Its totient is φ = 115506155520.

The previous prime is 649562773823. The next prime is 649562773901. The reversal of 649562773860 is 68377265946.

649562773860 is a `hidden beast` number, since 6 + 4 + 9 + 562 + 7 + 7 + 3 + 8 + 60 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 767 ways as a sum of consecutive naturals, for example, 11009538511 + ... + 11009538569.

It is an arithmetic number, because the mean of its divisors is an integer number (1261260000).

Almost surely, 2^649562773860 is an apocalyptic number.

649562773860 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 649562773860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1452971520000).

649562773860 is an abundant number, since it is smaller than the sum of its proper divisors (2256380266140).

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

649562773860 is a wasteful number, since it uses less digits than its factorization.

649562773860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191 (or 172 counting only the distinct ones).

The product of its (nonzero) digits is 91445760, while the sum is 63.

The spelling of 649562773860 in words is "six hundred forty-nine billion, five hundred sixty-two million, seven hundred seventy-three thousand, eight hundred sixty".