191662385457 has 16 divisors (see below), whose sum is σ = 258508639872. Its totient is φ = 126298836480.

The previous prime is 191662385441. The next prime is 191662385479. The reversal of 191662385457 is 754583266191.

It is not a de Polignac number, because 191662385457 - 2⁴ = 191662385441 is a prime.

It is a super-4 number, since 4×191662385457⁴ (a number of 46 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 191662385397 and 191662385406.

It is not an unprimeable number, because it can be changed into a prime (191662385557) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 181269 + ... + 645122.

It is an arithmetic number, because the mean of its divisors is an integer number (16156789992).

Almost surely, 2^191662385457 is an apocalyptic number.

It is an amenable number.

191662385457 is a deficient number, since it is larger than the sum of its proper divisors (66846254415).

191662385457 is an equidigital number, since it uses as much as digits as its factorization.

191662385457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 827288.

The product of its digits is 10886400, while the sum is 57.

The spelling of 191662385457 in words is "one hundred ninety-one billion, six hundred sixty-two million, three hundred eighty-five thousand, four hundred fifty-seven".