77807231246497 has 4 divisors (see below), whose sum is σ = 77847152865300. Its totient is φ = 77767309627696.

The previous prime is 77807231246471. The next prime is 77807231246539. The reversal of 77807231246497 is 79464213270877.

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

It can be written as a sum of positive squares in 2 ways, for example, as 47439019984801 + 30368211261696 = 6887599^2 + 5510736^2 .

It is a cyclic number.

It is not a de Polignac number, because 77807231246497 - 2¹⁹ = 77807230722209 is a prime.

It is a super-3 number, since 3×77807231246497³ (a number of 43 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77807231246417) 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, 19960806478 + ... + 19960810375.

It is an arithmetic number, because the mean of its divisors is an integer number (19461788216325).

Almost surely, 2^{77807231246497} is an apocalyptic number.

It is an amenable number.

77807231246497 is a deficient number, since it is larger than the sum of its proper divisors (39921618803).

77807231246497 is a wasteful number, since it uses less digits than its factorization.

77807231246497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39921618802.

The product of its (nonzero) digits is 199148544, while the sum is 67.

The spelling of 77807231246497 in words is "seventy-seven trillion, eight hundred seven billion, two hundred thirty-one million, two hundred forty-six thousand, four hundred ninety-seven".