191643958545 has 64 divisors (see below), whose sum is σ = 334266186240. Its totient is φ = 93193132032.

The previous prime is 191643958501. The next prime is 191643958553. The reversal of 191643958545 is 545859346191.

It is not a de Polignac number, because 191643958545 - 2⁶ = 191643958481 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 18963964 + ... + 18974066.

It is an arithmetic number, because the mean of its divisors is an integer number (5222909160).

Almost surely, 2^191643958545 is an apocalyptic number.

191643958545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

191643958545 is a deficient number, since it is larger than the sum of its proper divisors (142622227695).

191643958545 is a wasteful number, since it uses less digits than its factorization.

191643958545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11306.

The product of its digits is 23328000, while the sum is 60.

The spelling of 191643958545 in words is "one hundred ninety-one billion, six hundred forty-three million, nine hundred fifty-eight thousand, five hundred forty-five".