1621168049194 has 4 divisors (see below), whose sum is σ = 2431752073794. Its totient is φ = 810584024596.

The previous prime is 1621168049183. The next prime is 1621168049209. The reversal of 1621168049194 is 4919408611261.

It is a happy number.

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., 1104573674169 + 516594375025 = 1050987^2 + 718745^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 405292012297 + ... + 405292012300.

Almost surely, 2^{1621168049194} is an apocalyptic number.

1621168049194 is a deficient number, since it is larger than the sum of its proper divisors (810584024600).

1621168049194 is an equidigital number, since it uses as much as digits as its factorization.

1621168049194 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 810584024599.

The product of its (nonzero) digits is 746496, while the sum is 52.

The spelling of 1621168049194 in words is "one trillion, six hundred twenty-one billion, one hundred sixty-eight million, forty-nine thousand, one hundred ninety-four".