656994745 has 16 divisors (see below), whose sum is σ = 860932800. Its totient is φ = 477332800.

The previous prime is 656994743. The next prime is 656994761. The reversal of 656994745 is 547499656.

It is a happy number.

It is not a de Polignac number, because 656994745 - 2¹ = 656994743 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (55).

It is not an unprimeable number, because it can be changed into a prime (656994743) 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, 54531 + ... + 65479.

It is an arithmetic number, because the mean of its divisors is an integer number (53808300).

Almost surely, 2^656994745 is an apocalyptic number.

It is an amenable number.

656994745 is a deficient number, since it is larger than the sum of its proper divisors (203938055).

656994745 is a wasteful number, since it uses less digits than its factorization.

656994745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12056.

The product of its digits is 8164800, while the sum is 55.

The square root of 656994745 is about 25631.9087272095. The cubic root of 656994745 is about 869.3352675453.

The spelling of 656994745 in words is "six hundred fifty-six million, nine hundred ninety-four thousand, seven hundred forty-five".