74189129978 has 4 divisors (see below), whose sum is σ = 111283694970. Its totient is φ = 37094564988.

The previous prime is 74189129921. The next prime is 74189129999. The reversal of 74189129978 is 87992198147.

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

It can be written as a sum of positive squares in only one way, i.e., 57865745809 + 16323384169 = 240553^2 + 127763^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18547282493 + ... + 18547282496.

Almost surely, 2^74189129978 is an apocalyptic number.

74189129978 is a deficient number, since it is larger than the sum of its proper divisors (37094564992).

74189129978 is a wasteful number, since it uses less digits than its factorization.

74189129978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37094564991.

The product of its digits is 18289152, while the sum is 65.

The spelling of 74189129978 in words is "seventy-four billion, one hundred eighty-nine million, one hundred twenty-nine thousand, nine hundred seventy-eight".