1215554052101 has 8 divisors (see below), whose sum is σ = 1259794068600. Its totient is φ = 1171468992960.

The previous prime is 1215554052077. The next prime is 1215554052107. The reversal of 1215554052101 is 1012504555121.

It can be written as a sum of positive squares in 4 ways, for example, as 50505820225 + 1165048231876 = 224735^2 + 1079374^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1215554052101 is a prime.

It is a super-3 number, since 3×1215554052101³ (a number of 37 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215554052107) 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, 38723366 + ... + 38754743.

It is an arithmetic number, because the mean of its divisors is an integer number (157474258575).

Almost surely, 2^{1215554052101} is an apocalyptic number.

It is an amenable number.

1215554052101 is a deficient number, since it is larger than the sum of its proper divisors (44240016499).

1215554052101 is an equidigital number, since it uses as much as digits as its factorization.

1215554052101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77478679.

The product of its (nonzero) digits is 10000, while the sum is 32.

The spelling of 1215554052101 in words is "one trillion, two hundred fifteen billion, five hundred fifty-four million, fifty-two thousand, one hundred one".