1620659457 has 12 divisors (see below), whose sum is σ = 2341387620. Its totient is φ = 1080238848.

The previous prime is 1620659437. The next prime is 1620659477. The reversal of 1620659457 is 7549560261.

1620659457 is a `hidden beast` number, since 1 + 6 + 2 + 0 + 6 + 594 + 57 = 666.

It is an interprime number because it is at equal distance from previous prime (1620659437) and next prime (1620659477).

It can be written as a sum of positive squares in 2 ways, for example, as 930494016 + 690165441 = 30504^2 + 26271^2 .

It is not a de Polignac number, because 1620659457 - 2⁶ = 1620659393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1620659437) 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 11 ways as a sum of consecutive naturals, for example, 47269 + ... + 73997.

It is an arithmetic number, because the mean of its divisors is an integer number (195115635).

Almost surely, 2^1620659457 is an apocalyptic number.

It is an amenable number.

1620659457 is a deficient number, since it is larger than the sum of its proper divisors (720728163).

1620659457 is a wasteful number, since it uses less digits than its factorization.

1620659457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33472 (or 33469 counting only the distinct ones).

The product of its (nonzero) digits is 453600, while the sum is 45.

The square root of 1620659457 is about 40257.4149319104. The cubic root of 1620659457 is about 1174.6196341185.

The spelling of 1620659457 in words is "one billion, six hundred twenty million, six hundred fifty-nine thousand, four hundred fifty-seven".