78472338751901 has 2 divisors, whose sum is σ = 78472338751902. Its totient is φ = 78472338751900.

The previous prime is 78472338751897. The next prime is 78472338751913. The reversal of 78472338751901 is 10915783327487.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76152657449401 + 2319681302500 = 8726549^2 + 1523050^2 .

It is a cyclic number.

It is not a de Polignac number, because 78472338751901 - 2² = 78472338751897 is a prime.

It is a super-2 number, since 2×78472338751901² (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 (78472338751981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39236169375950 + 39236169375951.

It is an arithmetic number, because the mean of its divisors is an integer number (39236169375951).

Almost surely, 2^{78472338751901} is an apocalyptic number.

It is an amenable number.

78472338751901 is a deficient number, since it is larger than the sum of its proper divisors (1).

78472338751901 is an equidigital number, since it uses as much as digits as its factorization.

78472338751901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 71124480, while the sum is 65.

The spelling of 78472338751901 in words is "seventy-eight trillion, four hundred seventy-two billion, three hundred thirty-eight million, seven hundred fifty-one thousand, nine hundred one".