640620132545 has 8 divisors (see below), whose sum is σ = 768855628800. Its totient is φ = 512421792880.

The previous prime is 640620132491. The next prime is 640620132547. The reversal of 640620132545 is 545231026046.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 640620132545 - 2¹⁰ = 640620131521 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 640620132499 and 640620132508.

It is not an unprimeable number, because it can be changed into a prime (640620132547) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9251201 + ... + 9320190.

It is an arithmetic number, because the mean of its divisors is an integer number (96106953600).

Almost surely, 2^640620132545 is an apocalyptic number.

It is an amenable number.

640620132545 is a deficient number, since it is larger than the sum of its proper divisors (128235496255).

640620132545 is a wasteful number, since it uses less digits than its factorization.

640620132545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18578295.

The product of its (nonzero) digits is 172800, while the sum is 38.

The spelling of 640620132545 in words is "six hundred forty billion, six hundred twenty million, one hundred thirty-two thousand, five hundred forty-five".