40012355666 has 16 divisors (see below), whose sum is σ = 61656341400. Its totient is φ = 19460517120.

The previous prime is 40012355641. The next prime is 40012355693. The reversal of 40012355666 is 66655321004.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 36107980441 + 3904375225 = 190021^2 + 62485^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 232856 + ... + 366396.

Almost surely, 2^40012355666 is an apocalyptic number.

40012355666 is a deficient number, since it is larger than the sum of its proper divisors (21643985734).

40012355666 is a wasteful number, since it uses less digits than its factorization.

40012355666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137629.

The product of its (nonzero) digits is 129600, while the sum is 38.

The spelling of 40012355666 in words is "forty billion, twelve million, three hundred fifty-five thousand, six hundred sixty-six".