16167022978 has 4 divisors (see below), whose sum is σ = 24250534470. Its totient is φ = 8083511488.

The previous prime is 16167022969. The next prime is 16167022981. The reversal of 16167022978 is 87922076161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87922076161 = 17 ⋅5171886833.

It can be written as a sum of positive squares in only one way, i.e., 8928927049 + 7238095929 = 94493^2 + 85077^2 .

It is a super-2 number, since 2×16167022978² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4041755743 + ... + 4041755746.

Almost surely, 2^16167022978 is an apocalyptic number.

16167022978 is a deficient number, since it is larger than the sum of its proper divisors (8083511492).

16167022978 is an equidigital number, since it uses as much as digits as its factorization.

16167022978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8083511491.

The product of its (nonzero) digits is 508032, while the sum is 49.

The spelling of 16167022978 in words is "sixteen billion, one hundred sixty-seven million, twenty-two thousand, nine hundred seventy-eight".