1654605666 has 24 divisors (see below), whose sum is σ = 4097119104. Its totient is φ = 472744440.

The previous prime is 1654605649. The next prime is 1654605677. The reversal of 1654605666 is 6665064561.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6565770 + ... + 6566021.

It is an arithmetic number, because the mean of its divisors is an integer number (170713296).

Almost surely, 2^1654605666 is an apocalyptic number.

1654605666 is an abundant number, since it is smaller than the sum of its proper divisors (2442513438).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1654605666 is a wasteful number, since it uses less digits than its factorization.

1654605666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13131806 (or 13131803 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 45.

The square root of 1654605666 is about 40676.8443466304. The cubic root of 1654605666 is about 1182.7641952825.

The spelling of 1654605666 in words is "one billion, six hundred fifty-four million, six hundred five thousand, six hundred sixty-six".