561546354540 has 48 divisors (see below), whose sum is σ = 1577451439872. Its totient is φ = 149257918656.

The previous prime is 561546354469. The next prime is 561546354541. The reversal of 561546354540 is 45453645165.

It is a happy number.

It is a super-2 number, since 2×561546354540² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 561546354540.

It is not an unprimeable number, because it can be changed into a prime (561546354541) 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, 15224424 + ... + 15261263.

It is an arithmetic number, because the mean of its divisors is an integer number (32863571664).

Almost surely, 2^561546354540 is an apocalyptic number.

It is an amenable number.

561546354540 is an abundant number, since it is smaller than the sum of its proper divisors (1015905085332).

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

561546354540 is a wasteful number, since it uses less digits than its factorization.

561546354540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30486006 (or 30486004 counting only the distinct ones).

The product of its (nonzero) digits is 4320000, while the sum is 48.

The spelling of 561546354540 in words is "five hundred sixty-one billion, five hundred forty-six million, three hundred fifty-four thousand, five hundred forty".