77136531074 has 4 divisors (see below), whose sum is σ = 115704796614. Its totient is φ = 38568265536.

The previous prime is 77136531053. The next prime is 77136531079. The reversal of 77136531074 is 47013563177.

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., 75738892849 + 1397638225 = 275207^2 + 37385^2 .

It is a super-2 number, since 2×77136531074² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (77136531079) 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 as a sum of consecutive naturals, namely, 19284132767 + ... + 19284132770.

Almost surely, 2^77136531074 is an apocalyptic number.

77136531074 is a deficient number, since it is larger than the sum of its proper divisors (38568265540).

77136531074 is a wasteful number, since it uses less digits than its factorization.

77136531074 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38568265539.

The product of its (nonzero) digits is 370440, while the sum is 44.

The spelling of 77136531074 in words is "seventy-seven billion, one hundred thirty-six million, five hundred thirty-one thousand, seventy-four".