1670021783953 has 4 divisors (see below), whose sum is σ = 1710754022628. Its totient is φ = 1629289545280.

The previous prime is 1670021783951. The next prime is 1670021783957. The reversal of 1670021783953 is 3593871200761.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 41917239169 + 1628104544784 = 204737^2 + 1275972^2 .

It is a cyclic number.

It is not a de Polignac number, because 1670021783953 - 2¹ = 1670021783951 is a prime.

It is a super-4 number, since 4×1670021783953⁴ (a number of 50 digits) contains 4444 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1670021783953.

It is not an unprimeable number, because it can be changed into a prime (1670021783951) 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, 20366119276 + ... + 20366119357.

It is an arithmetic number, because the mean of its divisors is an integer number (427688505657).

Almost surely, 2^{1670021783953} is an apocalyptic number.

It is an amenable number.

1670021783953 is a deficient number, since it is larger than the sum of its proper divisors (40732238675).

1670021783953 is an equidigital number, since it uses as much as digits as its factorization.

1670021783953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40732238674.

The product of its (nonzero) digits is 1905120, while the sum is 52.

The spelling of 1670021783953 in words is "one trillion, six hundred seventy billion, twenty-one million, seven hundred eighty-three thousand, nine hundred fifty-three".