66124501661311 has 4 divisors (see below), whose sum is σ = 66126960670824. Its totient is φ = 66122042651800.

The previous prime is 66124501661299. The next prime is 66124501661347. The reversal of 66124501661311 is 11316610542166.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 66124501661311 - 2¹⁷ = 66124501530239 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66124501661411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1229464420 + ... + 1229518201.

It is an arithmetic number, because the mean of its divisors is an integer number (16531740167706).

Almost surely, 2^{66124501661311} is an apocalyptic number.

66124501661311 is a deficient number, since it is larger than the sum of its proper divisors (2459009513).

66124501661311 is a wasteful number, since it uses less digits than its factorization.

66124501661311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2459009512.

The product of its (nonzero) digits is 155520, while the sum is 43.

The spelling of 66124501661311 in words is "sixty-six trillion, one hundred twenty-four billion, five hundred one million, six hundred sixty-one thousand, three hundred eleven".