661056446545 has 16 divisors (see below), whose sum is σ = 910929458880. Its totient is φ = 455464728000.

The previous prime is 661056446471. The next prime is 661056446563. The reversal of 661056446545 is 545644650166.

It is not a de Polignac number, because 661056446545 - 2¹³ = 661056438353 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 661056446492 and 661056446501.

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, 316293906 + ... + 316295995.

It is an arithmetic number, because the mean of its divisors is an integer number (56933091180).

Almost surely, 2^661056446545 is an apocalyptic number.

It is an amenable number.

661056446545 is a deficient number, since it is larger than the sum of its proper divisors (249873012335).

661056446545 is a wasteful number, since it uses less digits than its factorization.

661056446545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 632589936.

The product of its (nonzero) digits is 10368000, while the sum is 52.

The spelling of 661056446545 in words is "six hundred sixty-one billion, fifty-six million, four hundred forty-six thousand, five hundred forty-five".