1651641656 has 32 divisors (see below), whose sum is σ = 3592064640. Its totient is φ = 697279968.

The previous prime is 1651641637. The next prime is 1651641659. The reversal of 1651641656 is 6561461561.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1651641659) 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, 216350 + ... + 223853.

It is an arithmetic number, because the mean of its divisors is an integer number (112252020).

Almost surely, 2^1651641656 is an apocalyptic number.

It is an amenable number.

1651641656 is an abundant number, since it is smaller than the sum of its proper divisors (1940422984).

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

1651641656 is a wasteful number, since it uses less digits than its factorization.

1651641656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 440283 (or 440279 counting only the distinct ones).

The product of its digits is 129600, while the sum is 41.

The square root of 1651641656 is about 40640.3943878501. The cubic root of 1651641656 is about 1182.0575172685.

The spelling of 1651641656 in words is "one billion, six hundred fifty-one million, six hundred forty-one thousand, six hundred fifty-six".