1020661726064 has 20 divisors (see below), whose sum is σ = 1988579765160. Its totient is φ = 507479851200.

The previous prime is 1020661726033. The next prime is 1020661726069. The reversal of 1020661726064 is 4606271660201.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020661726069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 178185287 + ... + 178191014.

It is an arithmetic number, because the mean of its divisors is an integer number (99428988258).

Almost surely, 2^{1020661726064} is an apocalyptic number.

It is an amenable number.

1020661726064 is a deficient number, since it is larger than the sum of its proper divisors (967918039096).

1020661726064 is a wasteful number, since it uses less digits than its factorization.

1020661726064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 356376488 (or 356376482 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 41.

The spelling of 1020661726064 in words is "one trillion, twenty billion, six hundred sixty-one million, seven hundred twenty-six thousand, sixty-four".