1611520723472 has 80 divisors (see below), whose sum is σ = 3454907157504. Its totient is φ = 722102160000.

The previous prime is 1611520723447. The next prime is 1611520723529. The reversal of 1611520723472 is 2743270251161.

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, 3250013 + ... + 3712899.

Almost surely, 2^{1611520723472} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1611520723472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1727453578752).

1611520723472 is an abundant number, since it is smaller than the sum of its proper divisors (1843386434032).

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

1611520723472 is a wasteful number, since it uses less digits than its factorization.

1611520723472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 463188 (or 463182 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 41.

The spelling of 1611520723472 in words is "one trillion, six hundred eleven billion, five hundred twenty million, seven hundred twenty-three thousand, four hundred seventy-two".