66120620761994 has 16 divisors (see below), whose sum is σ = 103138141086720. Its totient is φ = 31753177685040.

The previous prime is 66120620761961. The next prime is 66120620762011. The reversal of 66120620761994 is 49916702602166.

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, 2984310134 + ... + 2984332289.

It is an arithmetic number, because the mean of its divisors is an integer number (6446133817920).

Almost surely, 2^{66120620761994} is an apocalyptic number.

66120620761994 is a deficient number, since it is larger than the sum of its proper divisors (37017520324726).

66120620761994 is a wasteful number, since it uses less digits than its factorization.

66120620761994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5968642645.

The product of its (nonzero) digits is 11757312, while the sum is 59.

The spelling of 66120620761994 in words is "sixty-six trillion, one hundred twenty billion, six hundred twenty million, seven hundred sixty-one thousand, nine hundred ninety-four".