561620450728854 has 64 divisors (see below), whose sum is σ = 1408452541056000. Its totient is φ = 164319463113120.

The previous prime is 561620450728837. The next prime is 561620450728877. The reversal of 561620450728854 is 458827054026165.

It is a happy number.

561620450728854 is a `hidden beast` number, since 5 + 6 + 1 + 6 + 20 + 4 + 507 + 28 + 85 + 4 = 666.

It is a super-2 number, since 2×561620450728854² (a number of 30 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 561620450728791 and 561620450728800.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16301516814 + ... + 16301551265.

It is an arithmetic number, because the mean of its divisors is an integer number (22007070954000).

Almost surely, 2^{561620450728854} is an apocalyptic number.

561620450728854 is a gapful number since it is divisible by the number (54) formed by its first and last digit.

561620450728854 is an abundant number, since it is smaller than the sum of its proper divisors (846832090327146).

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

561620450728854 is a wasteful number, since it uses less digits than its factorization.

561620450728854 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32603068130 (or 32603068124 counting only the distinct ones).

The product of its (nonzero) digits is 129024000, while the sum is 63.

The spelling of 561620450728854 in words is "five hundred sixty-one trillion, six hundred twenty billion, four hundred fifty million, seven hundred twenty-eight thousand, eight hundred fifty-four".