78625532731 has 2 divisors, whose sum is σ = 78625532732. Its totient is φ = 78625532730.

The previous prime is 78625532719. The next prime is 78625532747. The reversal of 78625532731 is 13723552687.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78625532731 - 2¹⁹ = 78625008443 is a prime.

It is a super-2 number, since 2×78625532731² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78625532231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39312766365 + 39312766366.

It is an arithmetic number, because the mean of its divisors is an integer number (39312766366).

Almost surely, 2^78625532731 is an apocalyptic number.

78625532731 is a deficient number, since it is larger than the sum of its proper divisors (1).

78625532731 is an equidigital number, since it uses as much as digits as its factorization.

78625532731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2116800, while the sum is 49.

The spelling of 78625532731 in words is "seventy-eight billion, six hundred twenty-five million, five hundred thirty-two thousand, seven hundred thirty-one".