6665890054 has 16 divisors (see below), whose sum is σ = 10043030592. Its totient is φ = 3318236608.

The previous prime is 6665890051. The next prime is 6665890073. The reversal of 6665890054 is 4500985666.

It is a happy number.

It is a super-2 number, since 2×6665890054² = 88868180424032245832, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6665890051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 641202 + ... + 651514.

It is an arithmetic number, because the mean of its divisors is an integer number (627689412).

Almost surely, 2^6665890054 is an apocalyptic number.

6665890054 is a deficient number, since it is larger than the sum of its proper divisors (3377140538).

6665890054 is a wasteful number, since it uses less digits than its factorization.

6665890054 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11711.

The product of its (nonzero) digits is 1555200, while the sum is 49.

The square root of 6665890054 is about 81644.9021923598. The cubic root of 6665890054 is about 1881.9989728741.

The spelling of 6665890054 in words is "six billion, six hundred sixty-five million, eight hundred ninety thousand, fifty-four".