78155639059703 has 2 divisors, whose sum is σ = 78155639059704. Its totient is φ = 78155639059702.

The previous prime is 78155639059679. The next prime is 78155639059709. The reversal of 78155639059703 is 30795093655187.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78155639059703 - 2¹² = 78155639055607 is a prime.

It is a super-2 number, since 2×78155639059703² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78155639059709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39077819529851 + 39077819529852.

It is an arithmetic number, because the mean of its divisors is an integer number (39077819529852).

Almost surely, 2^{78155639059703} is an apocalyptic number.

78155639059703 is a deficient number, since it is larger than the sum of its proper divisors (1).

78155639059703 is an equidigital number, since it uses as much as digits as its factorization.

78155639059703 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 214326000, while the sum is 68.

The spelling of 78155639059703 in words is "seventy-eight trillion, one hundred fifty-five billion, six hundred thirty-nine million, fifty-nine thousand, seven hundred three".