78461632477 has 2 divisors, whose sum is σ = 78461632478. Its totient is φ = 78461632476.

The previous prime is 78461632451. The next prime is 78461632537. The reversal of 78461632477 is 77423616487.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72646959961 + 5814672516 = 269531^2 + 76254^2 .

It is a cyclic number.

It is not a de Polignac number, because 78461632477 - 2⁷ = 78461632349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78461632577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39230816238 + 39230816239.

It is an arithmetic number, because the mean of its divisors is an integer number (39230816239).

Almost surely, 2^78461632477 is an apocalyptic number.

It is an amenable number.

78461632477 is a deficient number, since it is larger than the sum of its proper divisors (1).

78461632477 is an equidigital number, since it uses as much as digits as its factorization.

78461632477 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9483264, while the sum is 55.

The spelling of 78461632477 in words is "seventy-eight billion, four hundred sixty-one million, six hundred thirty-two thousand, four hundred seventy-seven".