77506238645 has 8 divisors (see below), whose sum is σ = 101462712480. Its totient is φ = 56368173520.

The previous prime is 77506238639. The next prime is 77506238647. The reversal of 77506238645 is 54683260577.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 77506238645 - 2³⁴ = 60326369461 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77506238647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 704602115 + ... + 704602224.

It is an arithmetic number, because the mean of its divisors is an integer number (12682839060).

Almost surely, 2^77506238645 is an apocalyptic number.

It is an amenable number.

77506238645 is a deficient number, since it is larger than the sum of its proper divisors (23956473835).

77506238645 is a wasteful number, since it uses less digits than its factorization.

77506238645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1409204355.

The product of its (nonzero) digits is 8467200, while the sum is 53.

The spelling of 77506238645 in words is "seventy-seven billion, five hundred six million, two hundred thirty-eight thousand, six hundred forty-five".