74191209478 has 4 divisors (see below), whose sum is σ = 111286814220. Its totient is φ = 37095604738.

The previous prime is 74191209383. The next prime is 74191209479. The reversal of 74191209478 is 87490219147.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74191209479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18547802368 + ... + 18547802371.

It is an arithmetic number, because the mean of its divisors is an integer number (27821703555).

Almost surely, 2^74191209478 is an apocalyptic number.

74191209478 is a deficient number, since it is larger than the sum of its proper divisors (37095604742).

74191209478 is a wasteful number, since it uses less digits than its factorization.

74191209478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37095604741.

The product of its (nonzero) digits is 1016064, while the sum is 52.

The spelling of 74191209478 in words is "seventy-four billion, one hundred ninety-one million, two hundred nine thousand, four hundred seventy-eight".