645929557 has 32 divisors (see below), whose sum is σ = 828172800. Its totient is φ = 489984768.

The previous prime is 645929551. The next prime is 645929579. The reversal of 645929557 is 755929546.

It is not a de Polignac number, because 645929557 - 2¹⁵ = 645896789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645929551) 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 31 ways as a sum of consecutive naturals, for example, 413544 + ... + 415102.

It is an arithmetic number, because the mean of its divisors is an integer number (25880400).

Almost surely, 2^645929557 is an apocalyptic number.

It is an amenable number.

645929557 is a deficient number, since it is larger than the sum of its proper divisors (182243243).

645929557 is a wasteful number, since it uses less digits than its factorization.

645929557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1765.

The product of its digits is 3402000, while the sum is 52.

The square root of 645929557 is about 25415.1442451150. The cubic root of 645929557 is about 864.4271244364.

The spelling of 645929557 in words is "six hundred forty-five million, nine hundred twenty-nine thousand, five hundred fifty-seven".