4642023167981 has 4 divisors (see below), whose sum is σ = 4650181381500. Its totient is φ = 4633864954464.

The previous prime is 4642023167939. The next prime is 4642023167987. The reversal of 4642023167981 is 1897613202464.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1851422848900 + 2790600319081 = 1360670^2 + 1670509^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4642023167981 is a prime.

It is a super-2 number, since 2×4642023167981² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4642023167987) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4079105906 + ... + 4079107043.

It is an arithmetic number, because the mean of its divisors is an integer number (1162545345375).

Almost surely, 2^{4642023167981} is an apocalyptic number.

It is an amenable number.

4642023167981 is a deficient number, since it is larger than the sum of its proper divisors (8158213519).

4642023167981 is an equidigital number, since it uses as much as digits as its factorization.

4642023167981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8158213518.

The product of its (nonzero) digits is 3483648, while the sum is 53.

The spelling of 4642023167981 in words is "four trillion, six hundred forty-two billion, twenty-three million, one hundred sixty-seven thousand, nine hundred eighty-one".