66011361245 has 4 divisors (see below), whose sum is σ = 79213633500. Its totient is φ = 52809088992.

The previous prime is 66011361239. The next prime is 66011361257. The reversal of 66011361245 is 54216311066.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54216311066 = 2 ⋅27108155533.

It can be written as a sum of positive squares in 2 ways, for example, as 9158681401 + 56852679844 = 95701^2 + 238438^2 .

It is a cyclic number.

It is not a de Polignac number, because 66011361245 - 2¹⁶ = 66011295709 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6601136120 + ... + 6601136129.

It is an arithmetic number, because the mean of its divisors is an integer number (19803408375).

Almost surely, 2^66011361245 is an apocalyptic number.

It is an amenable number.

66011361245 is a deficient number, since it is larger than the sum of its proper divisors (13202272255).

66011361245 is a wasteful number, since it uses less digits than its factorization.

66011361245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13202272254.

The product of its (nonzero) digits is 25920, while the sum is 35.

The spelling of 66011361245 in words is "sixty-six billion, eleven million, three hundred sixty-one thousand, two hundred forty-five".