649512165780 has 48 divisors (see below), whose sum is σ = 2020704517440. Its totient is φ = 173203244064.

The previous prime is 649512165769. The next prime is 649512165793. The reversal of 649512165780 is 87561215946.

It is a happy number.

649512165780 is a `hidden beast` number, since 6 + 4 + 9 + 51 + 2 + 16 + 578 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 601399614 + ... + 601400693.

It is an arithmetic number, because the mean of its divisors is an integer number (42098010780).

Almost surely, 2^649512165780 is an apocalyptic number.

649512165780 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

649512165780 is an abundant number, since it is smaller than the sum of its proper divisors (1371192351660).

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

649512165780 is a wasteful number, since it uses less digits than its factorization.

649512165780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1202800325 (or 1202800317 counting only the distinct ones).

The product of its (nonzero) digits is 3628800, while the sum is 54.

The spelling of 649512165780 in words is "six hundred forty-nine billion, five hundred twelve million, one hundred sixty-five thousand, seven hundred eighty".