1511215643440 has 80 divisors (see below), whose sum is σ = 3546912045600. Its totient is φ = 598770268160.

The previous prime is 1511215643429. The next prime is 1511215643449. The reversal of 1511215643440 is 443465121151.

It is a tau number, because it is divible by the number of its divisors (80).

It is a self number, because there is not a number n which added to its sum of digits gives 1511215643440.

It is not an unprimeable number, because it can be changed into a prime (1511215643449) 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, 4903011 + ... + 5202109.

It is an arithmetic number, because the mean of its divisors is an integer number (44336400570).

Almost surely, 2^{1511215643440} is an apocalyptic number.

1511215643440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1511215643440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1773456022800).

1511215643440 is an abundant number, since it is smaller than the sum of its proper divisors (2035696402160).

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

1511215643440 is a wasteful number, since it uses less digits than its factorization.

1511215643440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299710 (or 299704 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 37.

The spelling of 1511215643440 in words is "one trillion, five hundred eleven billion, two hundred fifteen million, six hundred forty-three thousand, four hundred forty".