661363067064 has 64 divisors (see below), whose sum is σ = 1892274278400. Its totient is φ = 188694324864.

The previous prime is 661363067023. The next prime is 661363067083. The reversal of 661363067064 is 460760363166.

It is a super-2 number, since 2×661363067064² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2657112 + ... + 2895335.

It is an arithmetic number, because the mean of its divisors is an integer number (29566785600).

Almost surely, 2^661363067064 is an apocalyptic number.

It is an amenable number.

661363067064 is an abundant number, since it is smaller than the sum of its proper divisors (1230911211336).

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

661363067064 is a wasteful number, since it uses less digits than its factorization.

661363067064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5553172 (or 5553168 counting only the distinct ones).

The product of its (nonzero) digits is 1959552, while the sum is 48.

The spelling of 661363067064 in words is "six hundred sixty-one billion, three hundred sixty-three million, sixty-seven thousand, sixty-four".