640620132546 has 32 divisors (see below), whose sum is σ = 1344252105216. Its totient is φ = 203263920000.

The previous prime is 640620132491. The next prime is 640620132547. The reversal of 640620132546 is 645231026046.

It is a Curzon number.

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 15 ways as a sum of consecutive naturals, for example, 28219755 + ... + 28242446.

It is an arithmetic number, because the mean of its divisors is an integer number (42007878288).

Almost surely, 2^640620132546 is an apocalyptic number.

640620132546 is an abundant number, since it is smaller than the sum of its proper divisors (703631972670).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

640620132546 is a wasteful number, since it uses less digits than its factorization.

640620132546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56462298.

The product of its (nonzero) digits is 207360, while the sum is 39.

The spelling of 640620132546 in words is "six hundred forty billion, six hundred twenty million, one hundred thirty-two thousand, five hundred forty-six".