1520666611618 has 144 divisors (see below), whose sum is σ = 3250658809440. Its totient is φ = 528266914560.

The previous prime is 1520666611573. The next prime is 1520666611631. The reversal of 1520666611618 is 8161166660251.

It is a Harshad number since it is a multiple of its sum of digits (49).

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 71 ways as a sum of consecutive naturals, for example, 3631621 + ... + 4028647.

It is an arithmetic number, because the mean of its divisors is an integer number (22574019510).

Almost surely, 2^{1520666611618} is an apocalyptic number.

1520666611618 is an abundant number, since it is smaller than the sum of its proper divisors (1729992197822).

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

1520666611618 is a wasteful number, since it uses less digits than its factorization.

1520666611618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397101 (or 397083 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 49.

The spelling of 1520666611618 in words is "one trillion, five hundred twenty billion, six hundred sixty-six million, six hundred eleven thousand, six hundred eighteen".