191396553450 has 24 divisors (see below), whose sum is σ = 474663452928. Its totient is φ = 51039080880.

The previous prime is 191396553449. The next prime is 191396553511. The reversal of 191396553450 is 54355693191.

It is a junction number, because it is equal to n+sod(n) for n = 191396553393 and 191396553402.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 637988362 + ... + 637988661.

It is an arithmetic number, because the mean of its divisors is an integer number (19777643872).

Almost surely, 2^191396553450 is an apocalyptic number.

191396553450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

191396553450 is an abundant number, since it is smaller than the sum of its proper divisors (283266899478).

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

191396553450 is a wasteful number, since it uses less digits than its factorization.

191396553450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1275977038 (or 1275977033 counting only the distinct ones).

The product of its (nonzero) digits is 2187000, while the sum is 51.

The spelling of 191396553450 in words is "one hundred ninety-one billion, three hundred ninety-six million, five hundred fifty-three thousand, four hundred fifty".