640725011 has 8 divisors (see below), whose sum is σ = 675512400. Its totient is φ = 606044160.

The previous prime is 640724989. The next prime is 640725023. The reversal of 640725011 is 110527046.

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 640725011 - 2²² = 636530707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (640725311) 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 7 ways as a sum of consecutive naturals, for example, 14126 + ... + 38483.

It is an arithmetic number, because the mean of its divisors is an integer number (84439050).

Almost surely, 2^640725011 is an apocalyptic number.

640725011 is a deficient number, since it is larger than the sum of its proper divisors (34787389).

640725011 is a wasteful number, since it uses less digits than its factorization.

640725011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53269.

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 640725011 is about 25312.5465135375. The cubic root of 640725011 is about 862.0991675539.

The spelling of 640725011 in words is "six hundred forty million, seven hundred twenty-five thousand, eleven".