75596921978 has 4 divisors (see below), whose sum is σ = 113395382970. Its totient is φ = 37798460988.

The previous prime is 75596921969. The next prime is 75596921989. The reversal of 75596921978 is 87912969557.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87912969557 = 7 ⋅12558995651.

It can be written as a sum of positive squares in only one way, i.e., 39914845369 + 35682076609 = 199787^2 + 188897^2 .

It is a super-2 number, since 2×75596921978² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18899230493 + ... + 18899230496.

Almost surely, 2^75596921978 is an apocalyptic number.

75596921978 is a deficient number, since it is larger than the sum of its proper divisors (37798460992).

75596921978 is a wasteful number, since it uses less digits than its factorization.

75596921978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37798460991.

The product of its digits is 85730400, while the sum is 68.

The spelling of 75596921978 in words is "seventy-five billion, five hundred ninety-six million, nine hundred twenty-one thousand, nine hundred seventy-eight".