78238553753 has 2 divisors, whose sum is σ = 78238553754. Its totient is φ = 78238553752.

The previous prime is 78238553749. The next prime is 78238553791. The reversal of 78238553753 is 35735583287.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46961923849 + 31276629904 = 216707^2 + 176852^2 .

It is a cyclic number.

It is not a de Polignac number, because 78238553753 - 2² = 78238553749 is a prime.

It is a super-2 number, since 2×78238553753² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78238153753) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39119276876 + 39119276877.

It is an arithmetic number, because the mean of its divisors is an integer number (39119276877).

Almost surely, 2^78238553753 is an apocalyptic number.

It is an amenable number.

78238553753 is a deficient number, since it is larger than the sum of its proper divisors (1).

78238553753 is an equidigital number, since it uses as much as digits as its factorization.

78238553753 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21168000, while the sum is 56.

The spelling of 78238553753 in words is "seventy-eight billion, two hundred thirty-eight million, five hundred fifty-three thousand, seven hundred fifty-three".