1651138368 has 112 divisors (see below), whose sum is σ = 4919715840. Its totient is φ = 484185600.

The previous prime is 1651138351. The next prime is 1651138369. The reversal of 1651138368 is 8638311561.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1651138369) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52863 + ... + 78081.

Almost surely, 2^1651138368 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1651138368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2459857920).

1651138368 is an abundant number, since it is smaller than the sum of its proper divisors (3268577472).

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

1651138368 is a wasteful number, since it uses less digits than its factorization.

1651138368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25276 (or 25266 counting only the distinct ones).

The product of its digits is 103680, while the sum is 42.

The square root of 1651138368 is about 40634.2019486048. The cubic root of 1651138368 is about 1181.9374396073.

The spelling of 1651138368 in words is "one billion, six hundred fifty-one million, one hundred thirty-eight thousand, three hundred sixty-eight".