85621457644 has 24 divisors (see below), whose sum is σ = 158671009728. Its totient is φ = 40287502080.

The previous prime is 85621457617. The next prime is 85621457659. The reversal of 85621457644 is 44675412658.

It is a junction number, because it is equal to n+sod(n) for n = 85621457591 and 85621457600.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 513354 + ... + 659374.

It is an arithmetic number, because the mean of its divisors is an integer number (6611292072).

Almost surely, 2^85621457644 is an apocalyptic number.

It is an amenable number.

85621457644 is a deficient number, since it is larger than the sum of its proper divisors (73049552084).

85621457644 is a wasteful number, since it uses less digits than its factorization.

85621457644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154665 (or 154663 counting only the distinct ones).

The product of its digits is 6451200, while the sum is 52.

The spelling of 85621457644 in words is "eighty-five billion, six hundred twenty-one million, four hundred fifty-seven thousand, six hundred forty-four".