66904195954 has 4 divisors (see below), whose sum is σ = 100356293934. Its totient is φ = 33452097976.

The previous prime is 66904195951. The next prime is 66904195979. The reversal of 66904195954 is 45959140966.

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., 56537901729 + 10366294225 = 237777^2 + 101815^2 .

It is a super-4 number, since 4×66904195954⁴ (a number of 44 digits) contains 4444 as substring.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (66904195951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16726048987 + ... + 16726048990.

Almost surely, 2^66904195954 is an apocalyptic number.

66904195954 is a deficient number, since it is larger than the sum of its proper divisors (33452097980).

66904195954 is a wasteful number, since it uses less digits than its factorization.

66904195954 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33452097979.

The product of its (nonzero) digits is 10497600, while the sum is 58.

The spelling of 66904195954 in words is "sixty-six billion, nine hundred four million, one hundred ninety-five thousand, nine hundred fifty-four".