671974891542 has 32 divisors (see below), whose sum is σ = 1493314673760. Its totient is φ = 223986060000.

The previous prime is 671974891501. The next prime is 671974891579. The reversal of 671974891542 is 245198479176.

671974891542 is a `hidden beast` number, since 6 + 7 + 1 + 9 + 7 + 4 + 89 + 1 + 542 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 671974891542.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2434068 + ... + 2696040.

It is an arithmetic number, because the mean of its divisors is an integer number (46666083555).

Almost surely, 2^671974891542 is an apocalyptic number.

671974891542 is an abundant number, since it is smaller than the sum of its proper divisors (821339782218).

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

671974891542 is a wasteful number, since it uses less digits than its factorization.

671974891542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309485 (or 309479 counting only the distinct ones).

The product of its digits is 30481920, while the sum is 63.

The spelling of 671974891542 in words is "six hundred seventy-one billion, nine hundred seventy-four million, eight hundred ninety-one thousand, five hundred forty-two".