561506515401 has 64 divisors (see below), whose sum is σ = 823461230592. Its totient is φ = 338264404992.

The previous prime is 561506515399. The next prime is 561506515403. The reversal of 561506515401 is 104515605165.

561506515401 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (561506515399) and next prime (561506515403).

It is not a de Polignac number, because 561506515401 - 2¹ = 561506515399 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a self number, because there is not a number n which added to its sum of digits gives 561506515401.

It is not an unprimeable number, because it can be changed into a prime (561506515403) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 254881566 + ... + 254883768.

It is an arithmetic number, because the mean of its divisors is an integer number (12866581728).

Almost surely, 2^561506515401 is an apocalyptic number.

It is an amenable number.

561506515401 is a deficient number, since it is larger than the sum of its proper divisors (261954715191).

561506515401 is a wasteful number, since it uses less digits than its factorization.

561506515401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3022.

The product of its (nonzero) digits is 90000, while the sum is 39.

The spelling of 561506515401 in words is "five hundred sixty-one billion, five hundred six million, five hundred fifteen thousand, four hundred one".