1642374851 has 4 divisors (see below), whose sum is σ = 1768711392. Its totient is φ = 1516038312.

The previous prime is 1642374847. The next prime is 1642374859. The reversal of 1642374851 is 1584732461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1584732461 = 13 ⋅121902497.

It is a cyclic number.

It is not a de Polignac number, because 1642374851 - 2² = 1642374847 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1642374799 and 1642374808.

It is not an unprimeable number, because it can be changed into a prime (1642374859) 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, 63168251 + ... + 63168276.

It is an arithmetic number, because the mean of its divisors is an integer number (442177848).

Almost surely, 2^1642374851 is an apocalyptic number.

1642374851 is a deficient number, since it is larger than the sum of its proper divisors (126336541).

1642374851 is a wasteful number, since it uses less digits than its factorization.

1642374851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126336540.

The product of its digits is 161280, while the sum is 41.

The square root of 1642374851 is about 40526.2242381399. The cubic root of 1642374851 is about 1179.8426609617.

The spelling of 1642374851 in words is "one billion, six hundred forty-two million, three hundred seventy-four thousand, eight hundred fifty-one".