191661494442 has 32 divisors (see below), whose sum is σ = 436351864320. Its totient is φ = 55554055920.

The previous prime is 191661494441. The next prime is 191661494461. The reversal of 191661494442 is 244494166191.

It is not an unprimeable number, because it can be changed into a prime (191661494441) 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, 63128092 + ... + 63131127.

It is an arithmetic number, because the mean of its divisors is an integer number (13635995760).

Almost surely, 2^191661494442 is an apocalyptic number.

191661494442 is an abundant number, since it is smaller than the sum of its proper divisors (244690369878).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

191661494442 is a wasteful number, since it uses less digits than its factorization.

191661494442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126259258.

The product of its digits is 1492992, while the sum is 51.

The spelling of 191661494442 in words is "one hundred ninety-one billion, six hundred sixty-one million, four hundred ninety-four thousand, four hundred forty-two".