1966738601 has 4 divisors (see below), whose sum is σ = 2012476752. Its totient is φ = 1921000452.

The previous prime is 1966738577. The next prime is 1966738607. The reversal of 1966738601 is 1068376691.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1068376691 = 10993 ⋅97187.

It is a cyclic number.

It is not a de Polignac number, because 1966738601 - 2⁶ = 1966738537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1966738607) 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, 22869011 + ... + 22869096.

It is an arithmetic number, because the mean of its divisors is an integer number (503119188).

Almost surely, 2^1966738601 is an apocalyptic number.

It is an amenable number.

1966738601 is a deficient number, since it is larger than the sum of its proper divisors (45738151).

1966738601 is an equidigital number, since it uses as much as digits as its factorization.

1966738601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45738150.

The product of its (nonzero) digits is 326592, while the sum is 47.

The square root of 1966738601 is about 44347.9266820897. The cubic root of 1966738601 is about 1252.8975132241.

The spelling of 1966738601 in words is "one billion, nine hundred sixty-six million, seven hundred thirty-eight thousand, six hundred one".