1656513646 has 8 divisors (see below), whose sum is σ = 2485860984. Its totient is φ = 827893320.

The previous prime is 1656513641. The next prime is 1656513667. The reversal of 1656513646 is 6463156561.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1656513641) 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, 176020 + ... + 185191.

It is an arithmetic number, because the mean of its divisors is an integer number (310732623).

Almost surely, 2^1656513646 is an apocalyptic number.

1656513646 is a deficient number, since it is larger than the sum of its proper divisors (829347338).

1656513646 is a wasteful number, since it uses less digits than its factorization.

1656513646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363506.

The product of its digits is 388800, while the sum is 43.

The square root of 1656513646 is about 40700.2904903638. The cubic root of 1656513646 is about 1183.2186486929.

The spelling of 1656513646 in words is "one billion, six hundred fifty-six million, five hundred thirteen thousand, six hundred forty-six".