191661961350 has 96 divisors (see below), whose sum is σ = 517591872000. Its totient is φ = 46750193280.

The previous prime is 191661961349. The next prime is 191661961409. The reversal of 191661961350 is 53169166191.

It is a self number, because there is not a number n which added to its sum of digits gives 191661961350.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1076830 + ... + 1242129.

It is an arithmetic number, because the mean of its divisors is an integer number (5391582000).

Almost surely, 2^191661961350 is an apocalyptic number.

191661961350 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

191661961350 is an abundant number, since it is smaller than the sum of its proper divisors (325929910650).

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

191661961350 is a wasteful number, since it uses less digits than its factorization.

191661961350 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2319022 (or 2319017 counting only the distinct ones).

The product of its (nonzero) digits is 262440, while the sum is 48.

The spelling of 191661961350 in words is "one hundred ninety-one billion, six hundred sixty-one million, nine hundred sixty-one thousand, three hundred fifty".