640146503621 has 4 divisors (see below), whose sum is σ = 648249624000. Its totient is φ = 632043383244.

The previous prime is 640146503593. The next prime is 640146503639. The reversal of 640146503621 is 126305641046.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 640146503621 - 2³⁰ = 639072761797 is a prime.

It is a super-2 number, since 2×640146503621² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640146503641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4051560071 + ... + 4051560228.

It is an arithmetic number, because the mean of its divisors is an integer number (162062406000).

Almost surely, 2^640146503621 is an apocalyptic number.

It is an amenable number.

640146503621 is a deficient number, since it is larger than the sum of its proper divisors (8103120379).

640146503621 is an equidigital number, since it uses as much as digits as its factorization.

640146503621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8103120378.

The product of its (nonzero) digits is 103680, while the sum is 38.

The spelling of 640146503621 in words is "six hundred forty billion, one hundred forty-six million, five hundred three thousand, six hundred twenty-one".