85557018621 has 4 divisors (see below), whose sum is σ = 114076024832. Its totient is φ = 57038012412.

The previous prime is 85557018619. The next prime is 85557018641. The reversal of 85557018621 is 12681075558.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 85557018621 - 2¹ = 85557018619 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85557018641) 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, 14259503101 + ... + 14259503106.

It is an arithmetic number, because the mean of its divisors is an integer number (28519006208).

Almost surely, 2^85557018621 is an apocalyptic number.

It is an amenable number.

85557018621 is a deficient number, since it is larger than the sum of its proper divisors (28519006211).

85557018621 is a wasteful number, since it uses less digits than its factorization.

85557018621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28519006210.

The product of its (nonzero) digits is 672000, while the sum is 48.

The spelling of 85557018621 in words is "eighty-five billion, five hundred fifty-seven million, eighteen thousand, six hundred twenty-one".