645346631025501 has 8 divisors (see below), whose sum is σ = 860475761699424. Its totient is φ = 430224293850960.

The previous prime is 645346631025433. The next prime is 645346631025517. The reversal of 645346631025501 is 105520136643546.

It is a happy number.

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

It is not a de Polignac number, because 645346631025501 - 2³¹ = 645344483541853 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645346631021501) 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, 1698153186 + ... + 1698533171.

It is an arithmetic number, because the mean of its divisors is an integer number (107559470212428).

Almost surely, 2^{645346631025501} is an apocalyptic number.

It is an amenable number.

645346631025501 is a deficient number, since it is larger than the sum of its proper divisors (215129130673923).

645346631025501 is a wasteful number, since it uses less digits than its factorization.

645346631025501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3396749691.

The product of its (nonzero) digits is 7776000, while the sum is 51.

The spelling of 645346631025501 in words is "six hundred forty-five trillion, three hundred forty-six billion, six hundred thirty-one million, twenty-five thousand, five hundred one".