1691994536151 has 4 divisors (see below), whose sum is σ = 2255992714872. Its totient is φ = 1127996357432.

The previous prime is 1691994536083. The next prime is 1691994536263. The reversal of 1691994536151 is 1516354991961.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1691994536151 - 2¹³ = 1691994527959 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1691994534151) 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, 281999089356 + ... + 281999089361.

It is an arithmetic number, because the mean of its divisors is an integer number (563998178718).

Almost surely, 2^{1691994536151} is an apocalyptic number.

1691994536151 is a deficient number, since it is larger than the sum of its proper divisors (563998178721).

1691994536151 is an equidigital number, since it uses as much as digits as its factorization.

1691994536151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 563998178720.

The product of its digits is 7873200, while the sum is 60.

The spelling of 1691994536151 in words is "one trillion, six hundred ninety-one billion, nine hundred ninety-four million, five hundred thirty-six thousand, one hundred fifty-one".