1651689616 has 40 divisors (see below), whose sum is σ = 3373784064. Its totient is φ = 781777920.

The previous prime is 1651689581. The next prime is 1651689623. The reversal of 1651689616 is 6169861561.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 1651689616.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12561 + ... + 58831.

Almost surely, 2^1651689616 is an apocalyptic number.

1651689616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1651689616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1686892032).

1651689616 is an abundant number, since it is smaller than the sum of its proper divisors (1722094448).

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

1651689616 is a wasteful number, since it uses less digits than its factorization.

1651689616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46399 (or 46393 counting only the distinct ones).

The product of its digits is 466560, while the sum is 49.

The square root of 1651689616 is about 40640.9844368957. The cubic root of 1651689616 is about 1182.0689585981.

The spelling of 1651689616 in words is "one billion, six hundred fifty-one million, six hundred eighty-nine thousand, six hundred sixteen".