85474942639 has 2 divisors, whose sum is σ = 85474942640. Its totient is φ = 85474942638.

The previous prime is 85474942547. The next prime is 85474942643. The reversal of 85474942639 is 93624947458.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 85474942639 - 2¹¹ = 85474940591 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85474942669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42737471319 + 42737471320.

It is an arithmetic number, because the mean of its divisors is an integer number (42737471320).

Almost surely, 2^85474942639 is an apocalyptic number.

85474942639 is a deficient number, since it is larger than the sum of its proper divisors (1).

85474942639 is an equidigital number, since it uses as much as digits as its factorization.

85474942639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52254720, while the sum is 61.

The spelling of 85474942639 in words is "eighty-five billion, four hundred seventy-four million, nine hundred forty-two thousand, six hundred thirty-nine".