78213700723507 has 2 divisors, whose sum is σ = 78213700723508. Its totient is φ = 78213700723506.

The previous prime is 78213700723471. The next prime is 78213700723547. The reversal of 78213700723507 is 70532700731287.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78213700723507 - 2¹¹ = 78213700721459 is a prime.

It is a super-2 number, since 2×78213700723507² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78213700723547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39106850361753 + 39106850361754.

It is an arithmetic number, because the mean of its divisors is an integer number (39106850361754).

Almost surely, 2^{78213700723507} is an apocalyptic number.

78213700723507 is a deficient number, since it is larger than the sum of its proper divisors (1).

78213700723507 is an equidigital number, since it uses as much as digits as its factorization.

78213700723507 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3457440, while the sum is 52.

The spelling of 78213700723507 in words is "seventy-eight trillion, two hundred thirteen billion, seven hundred million, seven hundred twenty-three thousand, five hundred seven".