77831851823045 has 32 divisors (see below), whose sum is σ = 101743498072800. Its totient is φ = 56918736101376.

The previous prime is 77831851823041. The next prime is 77831851823051. The reversal of 77831851823045 is 54032815813877.

It can be written as a sum of positive squares in 16 ways, for example, as 1762858986529 + 76068992836516 = 1327727^2 + 8721754^2 .

It is a cyclic number.

It is not a de Polignac number, because 77831851823045 - 2² = 77831851823041 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77831851823041) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19957250 + ... + 23536259.

It is an arithmetic number, because the mean of its divisors is an integer number (3179484314775).

Almost surely, 2^{77831851823045} is an apocalyptic number.

It is an amenable number.

77831851823045 is a deficient number, since it is larger than the sum of its proper divisors (23911646249755).

77831851823045 is a wasteful number, since it uses less digits than its factorization.

77831851823045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43494137.

The product of its (nonzero) digits is 45158400, while the sum is 62.

The spelling of 77831851823045 in words is "seventy-seven trillion, eight hundred thirty-one billion, eight hundred fifty-one million, eight hundred twenty-three thousand, forty-five".