191206621634 has 16 divisors (see below), whose sum is σ = 330140932800. Its totient is φ = 81356156784.

The previous prime is 191206621621. The next prime is 191206621637. The reversal of 191206621634 is 436126602191.

It is a junction number, because it is equal to n+sod(n) for n = 191206621591 and 191206621600.

It is not an unprimeable number, because it can be changed into a prime (191206621637) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49126169 + ... + 49130060.

It is an arithmetic number, because the mean of its divisors is an integer number (20633808300).

Almost surely, 2^191206621634 is an apocalyptic number.

191206621634 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

191206621634 is a deficient number, since it is larger than the sum of its proper divisors (138934311166).

191206621634 is a wasteful number, since it uses less digits than its factorization.

191206621634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98256377.

The product of its (nonzero) digits is 93312, while the sum is 41.

The spelling of 191206621634 in words is "one hundred ninety-one billion, two hundred six million, six hundred twenty-one thousand, six hundred thirty-four".