1651566444 has 48 divisors (see below), whose sum is σ = 4222108800. Its totient is φ = 498317440.

The previous prime is 1651566437. The next prime is 1651566457. The reversal of 1651566444 is 4446651561.

It is a happy number.

1651566444 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 1651566396 and 1651566405.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3907 + ... + 57605.

It is an arithmetic number, because the mean of its divisors is an integer number (87960600).

Almost surely, 2^1651566444 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 1651566444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2111054400).

1651566444 is an abundant number, since it is smaller than the sum of its proper divisors (2570542356).

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

1651566444 is a wasteful number, since it uses less digits than its factorization.

1651566444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53950 (or 53948 counting only the distinct ones).

The product of its digits is 345600, while the sum is 42.

The square root of 1651566444 is about 40639.4690418071. The cubic root of 1651566444 is about 1182.0395742603.

The spelling of 1651566444 in words is "one billion, six hundred fifty-one million, five hundred sixty-six thousand, four hundred forty-four".