16169041978 has 4 divisors (see below), whose sum is σ = 24253562970. Its totient is φ = 8084520988.

The previous prime is 16169041963. The next prime is 16169041979. The reversal of 16169041978 is 87914096161.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 15009435169 + 1159606809 = 122513^2 + 34053^2 .

It is a super-2 number, since 2×16169041978² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16169041979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4042260493 + ... + 4042260496.

Almost surely, 2^16169041978 is an apocalyptic number.

16169041978 is a deficient number, since it is larger than the sum of its proper divisors (8084520992).

16169041978 is an equidigital number, since it uses as much as digits as its factorization.

16169041978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8084520991.

The product of its (nonzero) digits is 653184, while the sum is 52.

The spelling of 16169041978 in words is "sixteen billion, one hundred sixty-nine million, forty-one thousand, nine hundred seventy-eight".