561697688370 has 512 divisors, whose sum is σ = 1839882240000. Its totient is φ = 108637562880.

The previous prime is 561697688341. The next prime is 561697688411. The reversal of 561697688370 is 73886796165.

It is an unprimeable number.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 78786966 + ... + 78794094.

It is an arithmetic number, because the mean of its divisors is an integer number (3593520000).

Almost surely, 2^561697688370 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 561697688370, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (919941120000).

561697688370 is an abundant number, since it is smaller than the sum of its proper divisors (1278184551630).

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

561697688370 is a wasteful number, since it uses less digits than its factorization.

561697688370 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7223 (or 7209 counting only the distinct ones).

The product of its (nonzero) digits is 91445760, while the sum is 66.

The spelling of 561697688370 in words is "five hundred sixty-one billion, six hundred ninety-seven million, six hundred eighty-eight thousand, three hundred seventy".