84990551644 has 12 divisors (see below), whose sum is σ = 152361111168. Its totient is φ = 41458805600.

The previous prime is 84990551641. The next prime is 84990551677. The reversal of 84990551644 is 44615509948.

It is a super-2 number, since 2×84990551644² (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 (84990551641) 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, 259117372 + ... + 259117699.

It is an arithmetic number, because the mean of its divisors is an integer number (12696759264).

Almost surely, 2^84990551644 is an apocalyptic number.

It is an amenable number.

84990551644 is a deficient number, since it is larger than the sum of its proper divisors (67370559524).

84990551644 is a wasteful number, since it uses less digits than its factorization.

84990551644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 518235116 (or 518235114 counting only the distinct ones).

The product of its (nonzero) digits is 6220800, while the sum is 55.

The spelling of 84990551644 in words is "eighty-four billion, nine hundred ninety million, five hundred fifty-one thousand, six hundred forty-four".