16661379274 has 4 divisors (see below), whose sum is σ = 24992068914. Its totient is φ = 8330689636.

The previous prime is 16661379271. The next prime is 16661379283. The reversal of 16661379274 is 47297316661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 47297316661 = 7 ⋅6756759523.

It can be written as a sum of positive squares in only one way, i.e., 14613183225 + 2048196049 = 120885^2 + 45257^2 .

It is a super-6 number, since 6×16661379274⁶ (a number of 63 digits) contains 666666 as substring.

It is not an unprimeable number, because it can be changed into a prime (16661379271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4165344817 + ... + 4165344820.

Almost surely, 2^16661379274 is an apocalyptic number.

16661379274 is a deficient number, since it is larger than the sum of its proper divisors (8330689640).

16661379274 is an equidigital number, since it uses as much as digits as its factorization.

16661379274 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8330689639.

The product of its digits is 2286144, while the sum is 52.

The spelling of 16661379274 in words is "sixteen billion, six hundred sixty-one million, three hundred seventy-nine thousand, two hundred seventy-four".