77242437653 has 4 divisors (see below), whose sum is σ = 77951083980. Its totient is φ = 76533791328.

The previous prime is 77242437641. The next prime is 77242437659. The reversal of 77242437653 is 35673424277.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 35673424277 = 9719 ⋅3670483.

It can be written as a sum of positive squares in 2 ways, for example, as 45470444644 + 31771993009 = 213238^2 + 178247^2 .

It is a cyclic number.

It is not a de Polignac number, because 77242437653 - 2⁶ = 77242437589 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 (77242437659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 354323000 + ... + 354323217.

It is an arithmetic number, because the mean of its divisors is an integer number (19487770995).

Almost surely, 2^77242437653 is an apocalyptic number.

It is an amenable number.

77242437653 is a deficient number, since it is larger than the sum of its proper divisors (708646327).

77242437653 is a wasteful number, since it uses less digits than its factorization.

77242437653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 708646326.

The product of its digits is 5927040, while the sum is 50.

The spelling of 77242437653 in words is "seventy-seven billion, two hundred forty-two million, four hundred thirty-seven thousand, six hundred fifty-three".