100621401505 has 8 divisors (see below), whose sum is σ = 122102375400. Its totient is φ = 79592658816.

The previous prime is 100621401493. The next prime is 100621401539. The reversal of 100621401505 is 505104126001.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 22158108736 + 78463292769 = 148856^2 + 280113^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 100621401505 - 2²⁷ = 100487183777 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 100621401505.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 113057310 + ... + 113058199.

It is an arithmetic number, because the mean of its divisors is an integer number (15262796925).

Almost surely, 2^100621401505 is an apocalyptic number.

It is an amenable number.

100621401505 is a deficient number, since it is larger than the sum of its proper divisors (21480973895).

100621401505 is an equidigital number, since it uses as much as digits as its factorization.

100621401505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226115603.

The product of its (nonzero) digits is 1200, while the sum is 25.

Adding to 100621401505 its reverse (505104126001), we get a palindrome (605725527506).

The spelling of 100621401505 in words is "one hundred billion, six hundred twenty-one million, four hundred one thousand, five hundred five".