74166356887 has 4 divisors (see below), whose sum is σ = 84761550736. Its totient is φ = 63571163040.

The previous prime is 74166356863. The next prime is 74166356897. The reversal of 74166356887 is 78865366147.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78865366147 = 101891 ⋅774017.

It is a de Polignac number, because none of the positive numbers 2^k-74166356887 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74166356827) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 5297596914 + ... + 5297596927.

It is an arithmetic number, because the mean of its divisors is an integer number (21190387684).

Almost surely, 2^74166356887 is an apocalyptic number.

74166356887 is a deficient number, since it is larger than the sum of its proper divisors (10595193849).

74166356887 is a wasteful number, since it uses less digits than its factorization.

74166356887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10595193848.

The product of its digits is 40642560, while the sum is 61.

The spelling of 74166356887 in words is "seventy-four billion, one hundred sixty-six million, three hundred fifty-six thousand, eight hundred eighty-seven".