74155723487 has 4 divisors (see below), whose sum is σ = 75880275240. Its totient is φ = 72431171736.

The previous prime is 74155723469. The next prime is 74155723519. The reversal of 74155723487 is 78432755147.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78432755147 = 23 ⋅3410119789.

It is a cyclic number.

It is not a de Polignac number, because 74155723487 - 2⁸ = 74155723231 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 (74155723387) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 862275812 + ... + 862275897.

It is an arithmetic number, because the mean of its divisors is an integer number (18970068810).

Almost surely, 2^74155723487 is an apocalyptic number.

74155723487 is a deficient number, since it is larger than the sum of its proper divisors (1724551753).

74155723487 is a wasteful number, since it uses less digits than its factorization.

74155723487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1724551752.

The product of its digits is 6585600, while the sum is 53.

The spelling of 74155723487 in words is "seventy-four billion, one hundred fifty-five million, seven hundred twenty-three thousand, four hundred eighty-seven".