1657930945 has 16 divisors (see below), whose sum is σ = 2171587392. Its totient is φ = 1205098560.

The previous prime is 1657930913. The next prime is 1657930949. The reversal of 1657930945 is 5490397561.

It is not a de Polignac number, because 1657930945 - 2⁵ = 1657930913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1657930949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 105574 + ... + 120256.

It is an arithmetic number, because the mean of its divisors is an integer number (135724212).

Almost surely, 2^1657930945 is an apocalyptic number.

It is an amenable number.

1657930945 is a deficient number, since it is larger than the sum of its proper divisors (513656447).

1657930945 is a wasteful number, since it uses less digits than its factorization.

1657930945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16752.

The product of its (nonzero) digits is 1020600, while the sum is 49.

The square root of 1657930945 is about 40717.6981790474. The cubic root of 1657930945 is about 1183.5560031059.

It can be divided in two parts, 16579 and 30945, that added together give a square (47524 = 218²).

The spelling of 1657930945 in words is "one billion, six hundred fifty-seven million, nine hundred thirty thousand, nine hundred forty-five".