77827456505231 has 4 divisors (see below), whose sum is σ = 77862720420672. Its totient is φ = 77792192589792.

The previous prime is 77827456505173. The next prime is 77827456505233. The reversal of 77827456505231 is 13250565472877.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 77827456505231 - 2⁶ = 77827456505167 is a prime.

It is a super-2 number, since 2×77827456505231² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77827456505233) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17631954410 + ... + 17631958823.

It is an arithmetic number, because the mean of its divisors is an integer number (19465680105168).

Almost surely, 2^{77827456505231} is an apocalyptic number.

77827456505231 is a deficient number, since it is larger than the sum of its proper divisors (35263915441).

77827456505231 is a wasteful number, since it uses less digits than its factorization.

77827456505231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35263915440.

The product of its (nonzero) digits is 98784000, while the sum is 62.

The spelling of 77827456505231 in words is "seventy-seven trillion, eight hundred twenty-seven billion, four hundred fifty-six million, five hundred five thousand, two hundred thirty-one".