78261325563 has 8 divisors (see below), whose sum is σ = 104361491776. Its totient is φ = 52167688200.

The previous prime is 78261325543. The next prime is 78261325573. The reversal of 78261325563 is 36552316287.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 78261325563 - 2⁵ = 78261325531 is a prime.

It is a super-2 number, since 2×78261325563² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78261325523) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1604173 + ... + 1652238.

It is an arithmetic number, because the mean of its divisors is an integer number (13045186472).

Almost surely, 2^78261325563 is an apocalyptic number.

78261325563 is a deficient number, since it is larger than the sum of its proper divisors (26100166213).

78261325563 is a wasteful number, since it uses less digits than its factorization.

78261325563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3264425.

The product of its digits is 1814400, while the sum is 48.

The spelling of 78261325563 in words is "seventy-eight billion, two hundred sixty-one million, three hundred twenty-five thousand, five hundred sixty-three".