640015619 has 2 divisors, whose sum is σ = 640015620. Its totient is φ = 640015618.

The previous prime is 640015583. The next prime is 640015633. The reversal of 640015619 is 916510046.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-640015619 is a prime.

It is a super-2 number, since 2×640015619² = 819239985127906322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (640012619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320007809 + 320007810.

It is an arithmetic number, because the mean of its divisors is an integer number (320007810).

Almost surely, 2^640015619 is an apocalyptic number.

640015619 is a deficient number, since it is larger than the sum of its proper divisors (1).

640015619 is an equidigital number, since it uses as much as digits as its factorization.

640015619 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 640015619 is about 25298.5299770560. The cubic root of 640015619 is about 861.7808863964.

The spelling of 640015619 in words is "six hundred forty million, fifteen thousand, six hundred nineteen".