1656745999 has 8 divisors (see below), whose sum is σ = 1796987808. Its totient is φ = 1521258240.

The previous prime is 1656745969. The next prime is 1656746009. The reversal of 1656745999 is 9995476561.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1656745999 - 2¹¹ = 1656743951 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1656745919) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1187787 + ... + 1189180.

It is an arithmetic number, because the mean of its divisors is an integer number (224623476).

Almost surely, 2^1656745999 is an apocalyptic number.

1656745999 is a deficient number, since it is larger than the sum of its proper divisors (140241809).

1656745999 is a wasteful number, since it uses less digits than its factorization.

1656745999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2377025.

The product of its digits is 18370800, while the sum is 61.

The square root of 1656745999 is about 40703.1448293618. The cubic root of 1656745999 is about 1183.2739679976.

The spelling of 1656745999 in words is "one billion, six hundred fifty-six million, seven hundred forty-five thousand, nine hundred ninety-nine".