636621641006502 has 8 divisors (see below), whose sum is σ = 1273243282013016. Its totient is φ = 212207213668832.

The previous prime is 636621641006437. The next prime is 636621641006531. The reversal of 636621641006502 is 205600146126636.

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

636621641006502 is an admirable number.

It is a super-2 number, since 2×636621641006502² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53051803417203 + ... + 53051803417214.

It is an arithmetic number, because the mean of its divisors is an integer number (159155410251627).

Almost surely, 2^{636621641006502} is an apocalyptic number.

636621641006502 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

636621641006502 is a wasteful number, since it uses less digits than its factorization.

636621641006502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106103606834422.

The product of its (nonzero) digits is 1866240, while the sum is 48.

The spelling of 636621641006502 in words is "six hundred thirty-six trillion, six hundred twenty-one billion, six hundred forty-one million, six thousand, five hundred two".