1656722045 has 16 divisors (see below), whose sum is σ = 2178370368. Its totient is φ = 1199571840.

The previous prime is 1656722021. The next prime is 1656722059. The reversal of 1656722045 is 5402276561.

It is not a de Polignac number, because 1656722045 - 2²⁴ = 1639944829 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53864 + ... + 78833.

It is an arithmetic number, because the mean of its divisors is an integer number (136148148).

Almost surely, 2^1656722045 is an apocalyptic number.

It is an amenable number.

1656722045 is a deficient number, since it is larger than the sum of its proper divisors (521648323).

1656722045 is a wasteful number, since it uses less digits than its factorization.

1656722045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132940.

The product of its (nonzero) digits is 100800, while the sum is 38.

The square root of 1656722045 is about 40702.8505758503. The cubic root of 1656722045 is about 1183.2682651960.

The spelling of 1656722045 in words is "one billion, six hundred fifty-six million, seven hundred twenty-two thousand, forty-five".