15005779966 has 4 divisors (see below), whose sum is σ = 22508669952. Its totient is φ = 7502889982.

The previous prime is 15005779951. The next prime is 15005780003. The reversal of 15005779966 is 66997750051.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66997750051 = 331 ⋅202410121.

It is a super-2 number, since 2×15005779966² (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 as a sum of consecutive naturals, namely, 3751444990 + ... + 3751444993.

It is an arithmetic number, because the mean of its divisors is an integer number (5627167488).

Almost surely, 2^15005779966 is an apocalyptic number.

15005779966 is a deficient number, since it is larger than the sum of its proper divisors (7502889986).

15005779966 is an equidigital number, since it uses as much as digits as its factorization.

15005779966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7502889985.

The product of its (nonzero) digits is 3572100, while the sum is 55.

The spelling of 15005779966 in words is "fifteen billion, five million, seven hundred seventy-nine thousand, nine hundred sixty-six".