1656391016 has 64 divisors (see below), whose sum is σ = 3620764800. Its totient is φ = 695688192.

The previous prime is 1656391013. The next prime is 1656391043. The reversal of 1656391016 is 6101936561.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1656391013) 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, 1509380 + ... + 1510476.

It is an arithmetic number, because the mean of its divisors is an integer number (56574450).

Almost surely, 2^1656391016 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 1656391016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1810382400).

1656391016 is an abundant number, since it is smaller than the sum of its proper divisors (1964373784).

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

1656391016 is a wasteful number, since it uses less digits than its factorization.

1656391016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1626 (or 1622 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 38.

The square root of 1656391016 is about 40698.7839621775. The cubic root of 1656391016 is about 1183.1894504862.

The spelling of 1656391016 in words is "one billion, six hundred fifty-six million, three hundred ninety-one thousand, sixteen".