646555351051644 has 48 divisors (see below), whose sum is σ = 1508983580596128. Its totient is φ = 215467823628288.

The previous prime is 646555351051537. The next prime is 646555351051667. The reversal of 646555351051644 is 446150153555646.

It is a super-2 number, since 2×646555351051644² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 902504674 + ... + 903220790.

It is an arithmetic number, because the mean of its divisors is an integer number (31437157929086).

Almost surely, 2^{646555351051644} is an apocalyptic number.

It is an amenable number.

646555351051644 is an abundant number, since it is smaller than the sum of its proper divisors (862428229544484).

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

646555351051644 is a wasteful number, since it uses less digits than its factorization.

646555351051644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 733694 (or 733692 counting only the distinct ones).

The product of its (nonzero) digits is 129600000, while the sum is 60.

The spelling of 646555351051644 in words is "six hundred forty-six trillion, five hundred fifty-five billion, three hundred fifty-one million, fifty-one thousand, six hundred forty-four".