16501420015 has 16 divisors (see below), whose sum is σ = 20167056000. Its totient is φ = 12958229152.

The previous prime is 16501420003. The next prime is 16501420027. The reversal of 16501420015 is 51002410561.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (16501420003) and next prime (16501420027).

It is a cyclic number.

It is not a de Polignac number, because 16501420015 - 2¹⁵ = 16501387247 is a prime.

It is a super-2 number, since 2×16501420015² (a number of 21 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 15 ways as a sum of consecutive naturals, for example, 160536 + ... + 242434.

It is an arithmetic number, because the mean of its divisors is an integer number (1260441000).

Almost surely, 2^16501420015 is an apocalyptic number.

16501420015 is a deficient number, since it is larger than the sum of its proper divisors (3665635985).

16501420015 is an equidigital number, since it uses as much as digits as its factorization.

16501420015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82646.

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

Adding to 16501420015 its reverse (51002410561), we get a palindrome (67503830576).

The spelling of 16501420015 in words is "sixteen billion, five hundred one million, four hundred twenty thousand, fifteen".