78377601623 has 2 divisors, whose sum is σ = 78377601624. Its totient is φ = 78377601622.

The previous prime is 78377601571. The next prime is 78377601629. The reversal of 78377601623 is 32610677387.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78377601623 is a prime.

It is a super-2 number, since 2×78377601623² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78377601629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39188800811 + 39188800812.

It is an arithmetic number, because the mean of its divisors is an integer number (39188800812).

Almost surely, 2^78377601623 is an apocalyptic number.

78377601623 is a deficient number, since it is larger than the sum of its proper divisors (1).

78377601623 is an equidigital number, since it uses as much as digits as its factorization.

78377601623 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1778112, while the sum is 50.

The spelling of 78377601623 in words is "seventy-eight billion, three hundred seventy-seven million, six hundred one thousand, six hundred twenty-three".