1651906644 has 24 divisors (see below), whose sum is σ = 4022034240. Its totient is φ = 526694784.

The previous prime is 1651906639. The next prime is 1651906649. The reversal of 1651906644 is 4466091561.

It is an interprime number because it is at equal distance from previous prime (1651906639) and next prime (1651906649).

It is a junction number, because it is equal to n+sod(n) for n = 1651906596 and 1651906605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1651906649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2992309 + ... + 2992860.

It is an arithmetic number, because the mean of its divisors is an integer number (167584760).

Almost surely, 2^1651906644 is an apocalyptic number.

It is an amenable number.

1651906644 is an abundant number, since it is smaller than the sum of its proper divisors (2370127596).

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

1651906644 is a wasteful number, since it uses less digits than its factorization.

1651906644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5985199 (or 5985197 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 42.

The square root of 1651906644 is about 40643.6544124664. The cubic root of 1651906644 is about 1182.1207299931.

The spelling of 1651906644 in words is "one billion, six hundred fifty-one million, nine hundred six thousand, six hundred forty-four".