1011666506601 has 16 divisors (see below), whose sum is σ = 1413143746560. Its totient is φ = 642550458000.

The previous prime is 1011666506597. The next prime is 1011666506707. The reversal of 1011666506601 is 1066056661101.

1011666506601 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1011666506601 - 2² = 1011666506597 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1011666506601.

It is not an unprimeable number, because it can be changed into a prime (1011666506801) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29189521 + ... + 29224158.

It is an arithmetic number, because the mean of its divisors is an integer number (88321484160).

Almost surely, 2^{1011666506601} is an apocalyptic number.

It is an amenable number.

1011666506601 is a deficient number, since it is larger than the sum of its proper divisors (401477239959).

1011666506601 is a wasteful number, since it uses less digits than its factorization.

1011666506601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58413956.

The product of its (nonzero) digits is 38880, while the sum is 39.

The spelling of 1011666506601 in words is "one trillion, eleven billion, six hundred sixty-six million, five hundred six thousand, six hundred one".