15501220266 has 64 divisors (see below), whose sum is σ = 36664012800. Its totient is φ = 4366499760.

The previous prime is 15501220249. The next prime is 15501220283. The reversal of 15501220266 is 66202210551.

It is an interprime number because it is at equal distance from previous prime (15501220249) and next prime (15501220283).

It is a super-2 number, since 2×15501220266² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 93075 + ... + 199161.

It is an arithmetic number, because the mean of its divisors is an integer number (572875200).

Almost surely, 2^15501220266 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15501220266, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18332006400).

15501220266 is an abundant number, since it is smaller than the sum of its proper divisors (21162792534).

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

15501220266 is a wasteful number, since it uses less digits than its factorization.

15501220266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106184 (or 106170 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 30.

The spelling of 15501220266 in words is "fifteen billion, five hundred one million, two hundred twenty thousand, two hundred sixty-six".