64642446040644 has 48 divisors (see below), whose sum is σ = 167592073387200. Its totient is φ = 21547411734528.

The previous prime is 64642446040643. The next prime is 64642446040729. The reversal of 64642446040644 is 44604064424646.

64642446040644 is a `hidden beast` number, since 6 + 4 + 6 + 4 + 24 + 4 + 604 + 0 + 6 + 4 + 4 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (64642446040643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40354699 + ... + 41925965.

It is an arithmetic number, because the mean of its divisors is an integer number (3491501528900).

Almost surely, 2^{64642446040644} is an apocalyptic number.

It is an amenable number.

64642446040644 is an abundant number, since it is smaller than the sum of its proper divisors (102949627346556).

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

64642446040644 is a wasteful number, since it uses less digits than its factorization.

64642446040644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1952209 (or 1952201 counting only the distinct ones).

The product of its (nonzero) digits is 42467328, while the sum is 54.

The spelling of 64642446040644 in words is "sixty-four trillion, six hundred forty-two billion, four hundred forty-six million, forty thousand, six hundred forty-four".