1661526404375 has 80 divisors (see below), whose sum is σ = 2239521123840. Its totient is φ = 1228328064000.

The previous prime is 1661526404341. The next prime is 1661526404429. The reversal of 1661526404375 is 5734046251661.

It is not a de Polignac number, because 1661526404375 - 2¹⁰ = 1661526403351 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 171339527 + ... + 171349223.

It is an arithmetic number, because the mean of its divisors is an integer number (27994014048).

Almost surely, 2^{1661526404375} is an apocalyptic number.

1661526404375 is a deficient number, since it is larger than the sum of its proper divisors (577994719465).

1661526404375 is an equidigital number, since it uses as much as digits as its factorization.

1661526404375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10090 (or 10075 counting only the distinct ones).

The product of its (nonzero) digits is 3628800, while the sum is 50.

The spelling of 1661526404375 in words is "one trillion, six hundred sixty-one billion, five hundred twenty-six million, four hundred four thousand, three hundred seventy-five".