36651321820 has 24 divisors (see below), whose sum is σ = 76972944384. Its totient is φ = 14659544256.

The previous prime is 36651321809. The next prime is 36651321821. The reversal of 36651321820 is 2812315663.

It is a super-2 number, since 2×36651321820² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 36651321820.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (36651321821) 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, 293797 + ... + 399523.

It is an arithmetic number, because the mean of its divisors is an integer number (3207206016).

Almost surely, 2^36651321820 is an apocalyptic number.

It is an amenable number.

36651321820 is an abundant number, since it is smaller than the sum of its proper divisors (40321622564).

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

36651321820 is a wasteful number, since it uses less digits than its factorization.

36651321820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123069 (or 123067 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 37.

The spelling of 36651321820 in words is "thirty-six billion, six hundred fifty-one million, three hundred twenty-one thousand, eight hundred twenty".