85516737647 has 4 divisors (see below), whose sum is σ = 93290986536. Its totient is φ = 77742488760.

The previous prime is 85516737643. The next prime is 85516737751. The reversal of 85516737647 is 74673761558.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 85516737647 - 2² = 85516737643 is a prime.

It is a super-2 number, since 2×85516737647² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85516737643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3887124428 + ... + 3887124449.

It is an arithmetic number, because the mean of its divisors is an integer number (23322746634).

Almost surely, 2^85516737647 is an apocalyptic number.

85516737647 is a deficient number, since it is larger than the sum of its proper divisors (7774248889).

85516737647 is a wasteful number, since it uses less digits than its factorization.

85516737647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7774248888.

The product of its digits is 29635200, while the sum is 59.

The spelling of 85516737647 in words is "eighty-five billion, five hundred sixteen million, seven hundred thirty-seven thousand, six hundred forty-seven".