661106881494 has 24 divisors (see below), whose sum is σ = 1507787625240. Its totient is φ = 208770594048.

The previous prime is 661106881481. The next prime is 661106881529. The reversal of 661106881494 is 494188601166.

661106881494 is a `hidden beast` number, since 6 + 6 + 1 + 10 + 68 + 81 + 494 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 661106881494.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 966530187 + ... + 966530870.

It is an arithmetic number, because the mean of its divisors is an integer number (62824484385).

Almost surely, 2^661106881494 is an apocalyptic number.

661106881494 is an abundant number, since it is smaller than the sum of its proper divisors (846680743746).

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

661106881494 is a wasteful number, since it uses less digits than its factorization.

661106881494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1933061084 (or 1933061081 counting only the distinct ones).

The product of its (nonzero) digits is 1990656, while the sum is 54.

The spelling of 661106881494 in words is "six hundred sixty-one billion, one hundred six million, eight hundred eighty-one thousand, four hundred ninety-four".