7801345642 has 4 divisors (see below), whose sum is σ = 11702018466. Its totient is φ = 3900672820.

The previous prime is 7801345613. The next prime is 7801345661. The reversal of 7801345642 is 2465431087.

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., 3927403561 + 3873942081 = 62669^2 + 62241^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 7801345595 and 7801345604.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1950336409 + ... + 1950336412.

Almost surely, 2^7801345642 is an apocalyptic number.

7801345642 is a deficient number, since it is larger than the sum of its proper divisors (3900672824).

7801345642 is a wasteful number, since it uses less digits than its factorization.

7801345642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3900672823.

The product of its (nonzero) digits is 161280, while the sum is 40.

The square root of 7801345642 is about 88325.2265324013. The cubic root of 7801345642 is about 1983.3065217256.

The spelling of 7801345642 in words is "seven billion, eight hundred one million, three hundred forty-five thousand, six hundred forty-two".