194756672321 has 4 divisors (see below), whose sum is σ = 196157799600. Its totient is φ = 193355545044.

The previous prime is 194756672317. The next prime is 194756672371. The reversal of 194756672321 is 123276657491.

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: 123276657491 = 13 ⋅9482819807.

It is a cyclic number.

It is not a de Polignac number, because 194756672321 - 2² = 194756672317 is a prime.

It is a super-2 number, since 2×194756672321² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (194756672371) 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, 700563431 + ... + 700563708.

It is an arithmetic number, because the mean of its divisors is an integer number (49039449900).

Almost surely, 2^194756672321 is an apocalyptic number.

It is an amenable number.

194756672321 is a deficient number, since it is larger than the sum of its proper divisors (1401127279).

194756672321 is a wasteful number, since it uses less digits than its factorization.

194756672321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1401127278.

The product of its digits is 3810240, while the sum is 53.

The spelling of 194756672321 in words is "one hundred ninety-four billion, seven hundred fifty-six million, six hundred seventy-two thousand, three hundred twenty-one".