78561307643 has 16 divisors (see below), whose sum is σ = 97546524096. Its totient is φ = 61608314880.

The previous prime is 78561307637. The next prime is 78561307651. The reversal of 78561307643 is 34670316587.

It is not a de Polignac number, because 78561307643 - 2¹² = 78561303547 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 78561307591 and 78561307600.

It is not an unprimeable number, because it can be changed into a prime (78561307663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3809678 + ... + 3830243.

It is an arithmetic number, because the mean of its divisors is an integer number (6096657756).

Almost surely, 2^78561307643 is an apocalyptic number.

78561307643 is a deficient number, since it is larger than the sum of its proper divisors (18985216453).

78561307643 is a wasteful number, since it uses less digits than its factorization.

78561307643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7640054.

The product of its (nonzero) digits is 2540160, while the sum is 50.

The spelling of 78561307643 in words is "seventy-eight billion, five hundred sixty-one million, three hundred seven thousand, six hundred forty-three".