1642945718 has 4 divisors (see below), whose sum is σ = 2464418580. Its totient is φ = 821472858.

The previous prime is 1642945693. The next prime is 1642945747. The reversal of 1642945718 is 8175492461.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8175492461 = 1847 ⋅4426363.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410736428 + ... + 410736431.

It is an arithmetic number, because the mean of its divisors is an integer number (616104645).

Almost surely, 2^1642945718 is an apocalyptic number.

1642945718 is a deficient number, since it is larger than the sum of its proper divisors (821472862).

1642945718 is an equidigital number, since it uses as much as digits as its factorization.

1642945718 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 821472861.

The product of its digits is 483840, while the sum is 47.

The square root of 1642945718 is about 40533.2668064147. The cubic root of 1642945718 is about 1179.9793441754.

The spelling of 1642945718 in words is "one billion, six hundred forty-two million, nine hundred forty-five thousand, seven hundred eighteen".