91782394454 has 4 divisors (see below), whose sum is σ = 137673591684. Its totient is φ = 45891197226.

The previous prime is 91782394439. The next prime is 91782394463. The reversal of 91782394454 is 45449328719.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 45449328719 = 43 ⋅1056961133.

It is a self number, because there is not a number n which added to its sum of digits gives 91782394454.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22945598612 + ... + 22945598615.

It is an arithmetic number, because the mean of its divisors is an integer number (34418397921).

Almost surely, 2^91782394454 is an apocalyptic number.

91782394454 is a deficient number, since it is larger than the sum of its proper divisors (45891197230).

91782394454 is a wasteful number, since it uses less digits than its factorization.

91782394454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45891197229.

The product of its digits is 8709120, while the sum is 56.

The spelling of 91782394454 in words is "ninety-one billion, seven hundred eighty-two million, three hundred ninety-four thousand, four hundred fifty-four".