191687790858496 has 27 divisors (see below), whose sum is σ = 382627243463493. Its totient is φ = 95843784668160.

The previous prime is 191687790858493. The next prime is 191687790858517. The reversal of 191687790858496 is 694858097786191.

The square root of 191687790858496 is 13845136.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 7527692144896 + 184160098713600 = 2743664^2 + 13570560^2 .

It is a super-3 number, since 3×191687790858496³ (a number of 44 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (191687790858493) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 221089516 + ... + 221954836.

Almost surely, 2^{191687790858496} is an apocalyptic number.

191687790858496 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

191687790858496 is the 13845136-th square number.

It is an amenable number.

191687790858496 is a deficient number, since it is larger than the sum of its proper divisors (190939452604997).

191687790858496 is an frugal number, since it uses more digits than its factorization.

191687790858496 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1730658 (or 865323 counting only the distinct ones).

The product of its (nonzero) digits is 13168189440, while the sum is 88.

The spelling of 191687790858496 in words is "one hundred ninety-one trillion, six hundred eighty-seven billion, seven hundred ninety million, eight hundred fifty-eight thousand, four hundred ninety-six".