20015377441561 has 8 divisors (see below), whose sum is σ = 20887427185920. Its totient is φ = 19143479025792.

The previous prime is 20015377441541. The next prime is 20015377441567. The reversal of 20015377441561 is 16514477351002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20015377441561 - 2⁹ = 20015377441049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20015377441567) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37561816 + ... + 38090953.

It is an arithmetic number, because the mean of its divisors is an integer number (2610928398240).

Almost surely, 2^{20015377441561} is an apocalyptic number.

It is an amenable number.

20015377441561 is a deficient number, since it is larger than the sum of its proper divisors (872049744359).

20015377441561 is a wasteful number, since it uses less digits than its factorization.

20015377441561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75664295.

The product of its (nonzero) digits is 705600, while the sum is 46.

The spelling of 20015377441561 in words is "twenty trillion, fifteen billion, three hundred seventy-seven million, four hundred forty-one thousand, five hundred sixty-one".