1637212642042 has 4 divisors (see below), whose sum is σ = 2455818963066. Its totient is φ = 818606321020.

The previous prime is 1637212641991. The next prime is 1637212642057. The reversal of 1637212642042 is 2402462127361.

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., 1024814053561 + 612398588481 = 1012331^2 + 782559^2 .

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 = 1637212641986 and 1637212642004.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 409303160509 + ... + 409303160512.

Almost surely, 2^{1637212642042} is an apocalyptic number.

1637212642042 is a deficient number, since it is larger than the sum of its proper divisors (818606321024).

1637212642042 is an equidigital number, since it uses as much as digits as its factorization.

1637212642042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 818606321023.

The product of its (nonzero) digits is 193536, while the sum is 40.

The spelling of 1637212642042 in words is "one trillion, six hundred thirty-seven billion, two hundred twelve million, six hundred forty-two thousand, forty-two".