2011505015666 has 4 divisors (see below), whose sum is σ = 3017257523502. Its totient is φ = 1005752507832.

The previous prime is 2011505015609. The next prime is 2011505015671. The reversal of 2011505015666 is 6665105051102.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1098293520025 + 913211495641 = 1047995^2 + 955621^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 502876253915 + ... + 502876253918.

Almost surely, 2^{2011505015666} is an apocalyptic number.

2011505015666 is a deficient number, since it is larger than the sum of its proper divisors (1005752507836).

2011505015666 is a wasteful number, since it uses less digits than its factorization.

2011505015666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1005752507835.

The product of its (nonzero) digits is 54000, while the sum is 38.

The spelling of 2011505015666 in words is "two trillion, eleven billion, five hundred five million, fifteen thousand, six hundred sixty-six".