1640120334442 has 4 divisors (see below), whose sum is σ = 2460180501666. Its totient is φ = 820060167220.

The previous prime is 1640120334379. The next prime is 1640120334469. The reversal of 1640120334442 is 2444330210461.

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., 1636713394281 + 3406940161 = 1279341^2 + 58369^2 .

It is a super-2 number, since 2×1640120334442² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1640120334398 and 1640120334407.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410030083609 + ... + 410030083612.

Almost surely, 2^{1640120334442} is an apocalyptic number.

1640120334442 is a deficient number, since it is larger than the sum of its proper divisors (820060167224).

1640120334442 is an equidigital number, since it uses as much as digits as its factorization.

1640120334442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 820060167223.

The product of its (nonzero) digits is 55296, while the sum is 34.

The spelling of 1640120334442 in words is "one trillion, six hundred forty billion, one hundred twenty million, three hundred thirty-four thousand, four hundred forty-two".